diff --git a/lib/AtomFeed.php b/lib/AtomFeed.php
index 042adbd1..7bd56075 100644
--- a/lib/AtomFeed.php
+++ b/lib/AtomFeed.php
@@ -83,7 +83,7 @@ class AtomFeed extends Feed{
 				$oldEntries[] = $obj;
 			}
 		}
-		catch(Exception $ex){
+		catch(Exception){
 			// Invalid XML
 			return true;
 		}
diff --git a/lib/Core.php b/lib/Core.php
index f55686d1..5557b660 100644
--- a/lib/Core.php
+++ b/lib/Core.php
@@ -41,7 +41,7 @@ if($GLOBALS['User'] === null){
 			$session->Create($httpBasicAuthLogin);
 			$GLOBALS['User'] = $session->User;
 		}
-		catch(Exception $ex){
+		catch(Exception){
 			// Do nothing
 		}
 	}
diff --git a/lib/Ebook.php b/lib/Ebook.php
index d7992b84..dbcfb6b3 100644
--- a/lib/Ebook.php
+++ b/lib/Ebook.php
@@ -113,7 +113,7 @@ class Ebook{
 			$this->TextSinglePageSizeUnit = $sizes[$factor] ?? '';
 			$this->TextSinglePageUrl = $this->Url . '/text/single-page';
 		}
-		catch(Exception $ex){
+		catch(Exception){
 			// Single page file doesn't exist, just pass
 		}
 
diff --git a/lib/HttpInput.php b/lib/HttpInput.php
index 4a043504..60f3b48d 100644
--- a/lib/HttpInput.php
+++ b/lib/HttpInput.php
@@ -100,7 +100,7 @@ class HttpInput{
 						try{
 							return intval($var);
 						}
-						catch(\Exception $ex){
+						catch(Exception){
 							return $default;
 						}
 					}
@@ -117,7 +117,7 @@ class HttpInput{
 						try{
 							return floatval($var);
 						}
-						catch(\Exception $ex){
+						catch(Exception){
 							return $default;
 						}
 					}
diff --git a/lib/Library.php b/lib/Library.php
index 60b1587a..0a9528da 100644
--- a/lib/Library.php
+++ b/lib/Library.php
@@ -132,7 +132,7 @@ class Library{
 		try{
 			return apcu_fetch('tag-' . $tag) ?? [];
 		}
-		catch(Safe\Exceptions\ApcuException $ex){
+		catch(Safe\Exceptions\ApcuException){
 			return [];
 		}
 	}
@@ -168,12 +168,12 @@ class Library{
 		try{
 			$results = apcu_fetch($variable);
 		}
-		catch(Safe\Exceptions\ApcuException $ex){
+		catch(Safe\Exceptions\ApcuException){
 			Library::RebuildCache();
 			try{
 				$results = apcu_fetch($variable);
 			}
-			catch(Safe\Exceptions\ApcuException $ex){
+			catch(Safe\Exceptions\ApcuException){
 				// We can get here if the cache is currently rebuilding from a different process.
 				// Nothing we can do but wait, so wait 20 seconds before retrying
 				sleep(20);
@@ -181,7 +181,7 @@ class Library{
 				try{
 					$results = apcu_fetch($variable);
 				}
-				catch(Safe\Exceptions\ApcuException $ex){
+				catch(Safe\Exceptions\ApcuException){
 					// Cache STILL rebuilding... give up silently for now
 				}
 			}
@@ -224,7 +224,7 @@ class Library{
 
 				$ebooks[] = new Ebook($ebookWwwFilesystemPath);
 			}
-			catch(\Exception $ex){
+			catch(\Exception){
 				// An error in a book isn't fatal; just carry on.
 			}
 		}
@@ -443,7 +443,7 @@ class Library{
 			$val = apcu_fetch($lockVar);
 			return;
 		}
-		catch(Safe\Exceptions\ApcuException $ex){
+		catch(Safe\Exceptions\ApcuException){
 			apcu_store($lockVar, true);
 		}
 
@@ -508,7 +508,7 @@ class Library{
 
 				$authors[$authorPath][] = $ebook;
 			}
-			catch(\Exception $ex){
+			catch(\Exception){
 				// An error in a book isn't fatal; just carry on.
 			}
 		}
diff --git a/lib/Log.php b/lib/Log.php
index f268aed9..4fc68c1a 100644
--- a/lib/Log.php
+++ b/lib/Log.php
@@ -29,7 +29,7 @@ class Log{
 			try{
 				$fp = fopen($this->LogFilePath, 'a+');
 			}
-			catch(\Exception $ex){
+			catch(Exception $ex){
 				self::WriteErrorLogEntry('Couldn\'t open log file: ' . $this->LogFilePath . '. Exception: ' . vds($ex));
 				return;
 			}
diff --git a/lib/Manual.php b/lib/Manual.php
index 439bed0b..4ec7a694 100644
--- a/lib/Manual.php
+++ b/lib/Manual.php
@@ -19,7 +19,7 @@ class Manual{
 				return null;
 			}
 		}
-		catch(\Exception $ex){
+		catch(Exception){
 			return null;
 		}
 	}
diff --git a/lib/NewsletterSubscription.php b/lib/NewsletterSubscription.php
index 34d0ae79..f1ea4810 100644
--- a/lib/NewsletterSubscription.php
+++ b/lib/NewsletterSubscription.php
@@ -38,7 +38,7 @@ class NewsletterSubscription extends PropertiesBase{
 		try{
 			$this->User = User::GetByEmail($this->User->Email);
 		}
-		catch(Exceptions\InvalidUserException $ex){
+		catch(Exceptions\InvalidUserException){
 			// User doesn't exist, create the user
 			$this->User->Create();
 		}
diff --git a/lib/OpdsNavigationFeed.php b/lib/OpdsNavigationFeed.php
index bdb7cca6..f427c577 100644
--- a/lib/OpdsNavigationFeed.php
+++ b/lib/OpdsNavigationFeed.php
@@ -31,7 +31,7 @@ class OpdsNavigationFeed extends OpdsFeed{
 					}
 				}
 			}
-			catch(Exception $ex){
+			catch(Exception){
 				// XML parsing failure
 			}
 		}
diff --git a/lib/Payment.php b/lib/Payment.php
index 00309d38..500d5f5a 100644
--- a/lib/Payment.php
+++ b/lib/Payment.php
@@ -40,7 +40,7 @@ class Payment extends PropertiesBase{
 						where UserId = ?
 					', [$this->User->Name, $this->User->UserId]);
 				}
-				catch(Exceptions\InvalidUserException $ex){
+				catch(Exceptions\InvalidUserException){
 					// User doesn't exist, create it now
 					$this->User->Create();
 				}
diff --git a/lib/PollVote.php b/lib/PollVote.php
index b050a37c..3105f7a2 100644
--- a/lib/PollVote.php
+++ b/lib/PollVote.php
@@ -61,7 +61,7 @@ class PollVote extends PropertiesBase{
 				$vote = PollVote::Get($this->PollItem->Poll->UrlName, $this->UserId);
 				$error->Add(new Exceptions\PollVoteExistsException($vote));
 			}
-			catch(Exceptions\InvalidPollVoteException $ex){
+			catch(Exceptions\InvalidPollVoteException){
 				// User hasn't voted yet, carry on
 			}
 
@@ -81,7 +81,7 @@ class PollVote extends PropertiesBase{
 				$this->User = User::GetByEmail($email);
 				$this->UserId = $this->User->UserId;
 			}
-			catch(Exceptions\InvalidUserException $ex){
+			catch(Exceptions\InvalidUserException){
 				// Can't validate patron email - do nothing for now,
 				// this will be caught later when we validate the vote during creation.
 				// Save the email in the User object in case we want it later,
diff --git a/lib/RssFeed.php b/lib/RssFeed.php
index ad5a7e75..9fba0acd 100644
--- a/lib/RssFeed.php
+++ b/lib/RssFeed.php
@@ -78,7 +78,7 @@ class RssFeed extends Feed{
 				$oldEntries[] = $obj;
 			}
 		}
-		catch(Exception $ex){
+		catch(Exception){
 			// Invalid XML
 			return true;
 		}
diff --git a/scripts/process-pending-payments b/scripts/process-pending-payments
index 87c57869..f3d8a098 100755
--- a/scripts/process-pending-payments
+++ b/scripts/process-pending-payments
@@ -105,7 +105,7 @@ try{
 			try{
 				$toggleButton = $driver->wait(20, 250)->until(WebDriverExpectedCondition::visibilityOfElementLocated(WebDriverBy::xpath('//button[contains(@class, "button-toggle")]')));
 			}
-			catch(Exception $ex){
+			catch(Exception){
 				$log->Write('Error: Couldn\'t find donation.');
 				continue;
 			}
@@ -147,7 +147,7 @@ try{
 					$payment->User = null;
 				}
 			}
-			catch(Exception $ex){
+			catch(Exception){
 				// Anonymous donations don't have these elements present and will throw an exception
 				$payment->User = null;
 			}
@@ -172,7 +172,7 @@ try{
 			try{
 				$payment->Create();
 			}
-			catch(Exceptions\PaymentExistsException $ex){
+			catch(Exceptions\PaymentExistsException){
 				// Payment already exists, just continue
 				$log->Write('Donation already in database.');
 				continue;
@@ -217,7 +217,7 @@ try{
 						try{
 							$patron->AlternateName = trim($detailsRow->findElement(WebDriverBy::xpath('//td[preceding-sibling::td[normalize-space(.) = "Attribution Text"]]'))->getText());
 						}
-						catch(Exception $ex){
+						catch(Exception){
 						}
 
 						$log->Write('Adding donor as patron ...');
diff --git a/www/bulk-downloads/collection.php b/www/bulk-downloads/collection.php
index 8a79e3a7..605efbf0 100644
--- a/www/bulk-downloads/collection.php
+++ b/www/bulk-downloads/collection.php
@@ -20,7 +20,7 @@ $collection = [];
 try{
 	$collection = apcu_fetch('bulk-downloads-' . $class);
 }
-catch(Safe\Exceptions\ApcuException $ex){
+catch(Safe\Exceptions\ApcuException){
 	$result = Library::RebuildBulkDownloadsCache();
 	$collection = $result[$class];
 }
diff --git a/www/bulk-downloads/download.php b/www/bulk-downloads/download.php
index 59c88204..a7fb3395 100644
--- a/www/bulk-downloads/download.php
+++ b/www/bulk-downloads/download.php
@@ -32,7 +32,7 @@ try{
 	header('Content-Disposition: attachment; filename="' . basename($path) . '"');
 	exit();
 }
-catch(Exceptions\LoginRequiredException $ex){
+catch(Exceptions\LoginRequiredException){
 	if(isset($_SERVER['HTTP_REFERER'])){
 		Template::RedirectToLogin(true, $_SERVER['HTTP_REFERER']);
 	}
@@ -48,10 +48,10 @@ catch(Exceptions\LoginRequiredException $ex){
 		}
 	}
 }
-catch(Exceptions\InvalidPermissionsException $ex){
+catch(Exceptions\InvalidPermissionsException){
 	http_response_code(403);
 }
-catch(Exceptions\InvalidFileException $ex){
+catch(Exceptions\InvalidFileException){
 	Template::Emit404();
 }
 
diff --git a/www/bulk-downloads/get.php b/www/bulk-downloads/get.php
index 69351734..45c0b371 100644
--- a/www/bulk-downloads/get.php
+++ b/www/bulk-downloads/get.php
@@ -21,7 +21,7 @@ try{
 		try{
 			$collections = apcu_fetch('bulk-downloads-collections');
 		}
-		catch(Safe\Exceptions\ApcuException $ex){
+		catch(Safe\Exceptions\ApcuException){
 			$result = Library::RebuildBulkDownloadsCache();
 			$collections = $result['collections'];
 		}
@@ -45,7 +45,7 @@ try{
 		try{
 			$collections = apcu_fetch('bulk-downloads-authors');
 		}
-		catch(Safe\Exceptions\ApcuException $ex){
+		catch(Safe\Exceptions\ApcuException){
 			$result = Library::RebuildBulkDownloadsCache();
 			$collections = $result['authors'];
 		}
@@ -62,13 +62,10 @@ try{
 		}
 	}
 }
-catch(Exceptions\InvalidUserException $ex){
-	$exception = new Exceptions\InvalidPatronException();
-}
-catch(Exceptions\InvalidAuthorException $ex){
+catch(Exceptions\InvalidAuthorException){
 	Template::Emit404();
 }
-catch(Exceptions\InvalidCollectionException $ex){
+catch(Exceptions\InvalidCollectionException){
 	Template::Emit404();
 }
 
diff --git a/www/ebooks/author.php b/www/ebooks/author.php
index 7c3966f0..2e9db621 100644
--- a/www/ebooks/author.php
+++ b/www/ebooks/author.php
@@ -23,7 +23,7 @@ try{
 	$author =  strip_tags($ebooks[0]->AuthorsHtml);
 	$authorUrl = Formatter::ToPlainText($ebooks[0]->AuthorsUrl);
 }
-catch(Exceptions\InvalidAuthorException $ex){
+catch(Exceptions\InvalidAuthorException){
 	Template::Emit404();
 }
 ?><?= Template::Header(['title' => 'Ebooks by ' . $author, 'feedUrl' => str_replace('/ebooks/', '/authors/', $authorUrl), 'feedTitle' => 'Standard Ebooks - Ebooks by ' . $author, 'highlight' => 'ebooks', 'description' => 'All of the Standard Ebooks ebooks by ' . $author]) ?>
diff --git a/www/ebooks/ebook.php b/www/ebooks/ebook.php
index 94b49747..4eec0f54 100644
--- a/www/ebooks/ebook.php
+++ b/www/ebooks/ebook.php
@@ -43,7 +43,7 @@ try{
 	try{
 		$ebook = apcu_fetch('ebook-' . $wwwFilesystemPath);
 	}
-	catch(Safe\Exceptions\ApcuException $ex){
+	catch(Safe\Exceptions\ApcuException){
 		$ebook = new Ebook($wwwFilesystemPath);
 	}
 
@@ -106,7 +106,7 @@ catch(Exceptions\SeeOtherEbookException $ex){
 	header('Location: ' . $ex->Url);
 	exit();
 }
-catch(Exceptions\InvalidEbookException $ex){
+catch(Exceptions\InvalidEbookException){
 	Template::Emit404();
 }
 ?><?= Template::Header(['title' => strip_tags($ebook->TitleWithCreditsHtml) . ' - Free ebook download', 'ogType' => 'book', 'coverUrl' => $ebook->DistCoverUrl, 'highlight' => 'ebooks', 'description' => 'Free epub ebook download of the Standard Ebooks edition of ' . $ebook->Title . ': ' . $ebook->Description]) ?>
diff --git a/www/ebooks/index.php b/www/ebooks/index.php
index cc398f4f..ddb8b5e4 100644
--- a/www/ebooks/index.php
+++ b/www/ebooks/index.php
@@ -120,7 +120,7 @@ try{
 		$feedTitle = 'Standard Ebooks - Ebooks in the ' . Formatter::ToPlainText($collectionName) . ' ' . $collectionType;
 	}
 }
-catch(Exceptions\InvalidCollectionException $ex){
+catch(Exceptions\InvalidCollectionException){
 	Template::Emit404();
 }
 ?><?= Template::Header(['title' => $pageTitle, 'feedUrl' => $feedUrl, 'feedTitle' => $feedTitle, 'highlight' => 'ebooks', 'description' => $pageDescription]) ?>
diff --git a/www/feeds/atom/search.php b/www/feeds/atom/search.php
index 4140b162..fc2214cb 100644
--- a/www/feeds/atom/search.php
+++ b/www/feeds/atom/search.php
@@ -11,7 +11,7 @@ try{
 		$ebooks = Library::Search($query);
 	}
 }
-catch(\Exception $ex){
+catch(\Exception){
 	http_response_code(500);
 	include(WEB_ROOT . '/404.php');
 	exit();
diff --git a/www/feeds/collection.php b/www/feeds/collection.php
index 9494a82f..f470bea5 100644
--- a/www/feeds/collection.php
+++ b/www/feeds/collection.php
@@ -29,7 +29,7 @@ if($type === 'atom'){
 try{
 	$feeds = apcu_fetch('feeds-index-' . $type . '-' . $class);
 }
-catch(Safe\Exceptions\ApcuException $ex){
+catch(Safe\Exceptions\ApcuException){
 	$feeds = Library::RebuildFeedsCache($type, $class);
 }
 ?><?= Template::Header(['title' => $ucType . ' Ebook Feeds by ' . $ucTitle, 'description' => 'A list of available ' . $ucType . ' feeds of Standard Ebooks ebooks by ' . $lcTitle . '.']) ?>
diff --git a/www/feeds/download.php b/www/feeds/download.php
index 7b247849..05f05487 100644
--- a/www/feeds/download.php
+++ b/www/feeds/download.php
@@ -70,14 +70,14 @@ try{
 
 	exit();
 }
-catch(Exceptions\LoginRequiredException $ex){
+catch(Exceptions\LoginRequiredException){
 	header('WWW-Authenticate: Basic realm="Enter your Patrons Circle email address and leave the password empty."');
 	http_response_code(401);
 }
-catch(Exceptions\InvalidPermissionsException $ex){
+catch(Exceptions\InvalidPermissionsException){
 	http_response_code(403);
 }
-catch(Exceptions\InvalidFileException $ex){
+catch(Exceptions\InvalidFileException){
 	Template::Emit404();
 }
 
diff --git a/www/feeds/get.php b/www/feeds/get.php
index 4c9304f8..5d2038b0 100644
--- a/www/feeds/get.php
+++ b/www/feeds/get.php
@@ -48,7 +48,7 @@ try{
 
 	$feedUrl = '/' . $name . '/' . $target;
 }
-catch(Exceptions\InvalidCollectionException $ex){
+catch(Exceptions\InvalidCollectionException){
 	Template::Emit404();
 }
 ?><?= Template::Header(['title' => $title, 'feedTitle' => $feedTitle, 'feedUrl' => $feedUrl, 'description' => $description]) ?>
diff --git a/www/feeds/opds/search.php b/www/feeds/opds/search.php
index ad9467e8..63977697 100644
--- a/www/feeds/opds/search.php
+++ b/www/feeds/opds/search.php
@@ -11,7 +11,7 @@ try{
 		$ebooks = Library::Search($query);
 	}
 }
-catch(\Exception $ex){
+catch(\Exception){
 	http_response_code(500);
 	exit();
 }
diff --git a/www/feeds/rss/search.php b/www/feeds/rss/search.php
index 0650af4d..b23cfb9c 100644
--- a/www/feeds/rss/search.php
+++ b/www/feeds/rss/search.php
@@ -11,7 +11,7 @@ try{
 		$ebooks = Library::Search($query);
 	}
 }
-catch(\Exception $ex){
+catch(\Exception){
 	http_response_code(500);
 	include(WEB_ROOT . '/404.php');
 	exit();
diff --git a/www/newsletter/subscriptions/confirm.php b/www/newsletter/subscriptions/confirm.php
index 6aea7988..7edb7ca5 100644
--- a/www/newsletter/subscriptions/confirm.php
+++ b/www/newsletter/subscriptions/confirm.php
@@ -16,6 +16,6 @@ try{
 	http_response_code(303);
 	header('Location: ' . $subscription->Url);
 }
-catch(Exceptions\InvalidNewsletterSubscriptionException $ex){
+catch(Exceptions\InvalidNewsletterSubscriptionException){
 	Template::Emit404();
 }
diff --git a/www/newsletter/subscriptions/delete.php b/www/newsletter/subscriptions/delete.php
index 2d3041bb..830f3afe 100644
--- a/www/newsletter/subscriptions/delete.php
+++ b/www/newsletter/subscriptions/delete.php
@@ -18,11 +18,11 @@ try{
 		exit();
 	}
 }
-catch(Exceptions\InvalidRequestException $ex){
+catch(Exceptions\InvalidRequestException){
 	http_response_code(405);
 	exit();
 }
-catch(Exceptions\InvalidNewsletterSubscriptionException $ex){
+catch(Exceptions\InvalidNewsletterSubscriptionException){
 	if($requestType == WEB){
 		Template::Emit404();
 	}
diff --git a/www/newsletter/subscriptions/get.php b/www/newsletter/subscriptions/get.php
index ae617110..da78295a 100644
--- a/www/newsletter/subscriptions/get.php
+++ b/www/newsletter/subscriptions/get.php
@@ -39,7 +39,7 @@ try{
 		http_response_code(201);
 	}
 }
-catch(Exceptions\SeException $ex){
+catch(Exceptions\SeException){
 	Template::Emit404();
 }
 
diff --git a/www/newsletter/subscriptions/post.php b/www/newsletter/subscriptions/post.php
index e4f326bb..51b5a947 100644
--- a/www/newsletter/subscriptions/post.php
+++ b/www/newsletter/subscriptions/post.php
@@ -74,7 +74,7 @@ try{
 		header('Location: /newsletter/subscriptions/success');
 	}
 }
-catch(Exceptions\NewsletterSubscriptionExistsException $ex){
+catch(Exceptions\NewsletterSubscriptionExistsException){
 	// Subscription exists.
 	if($requestType == WEB){
 		// If we're accessing from the web, update the subscription,
diff --git a/www/polls/get.php b/www/polls/get.php
index 151554f5..c153c375 100644
--- a/www/polls/get.php
+++ b/www/polls/get.php
@@ -20,13 +20,13 @@ try{
 		try{
 			PollVote::Get($poll->UrlName, $GLOBALS['User']->UserId);
 		}
-		catch(Exceptions\SeException $ex){
+		catch(Exceptions\SeException){
 			// User has already voted
 			$canVote = true;
 		}
 	}
 }
-catch(Exceptions\SeException $ex){
+catch(Exceptions\SeException){
 	Template::Emit404();
 }
 
diff --git a/www/polls/votes/get.php b/www/polls/votes/get.php
index a70b1cea..20d52c58 100644
--- a/www/polls/votes/get.php
+++ b/www/polls/votes/get.php
@@ -17,7 +17,7 @@ try{
 		session_unset();
 	}
 }
-catch(Exceptions\SeException $ex){
+catch(Exceptions\SeException){
 	Template::Emit404();
 }
 
diff --git a/www/polls/votes/index.php b/www/polls/votes/index.php
index c79d9888..284fad64 100644
--- a/www/polls/votes/index.php
+++ b/www/polls/votes/index.php
@@ -6,7 +6,7 @@ $poll = new Poll();
 try{
 	$poll = Poll::GetByUrlName(HttpInput::Str(GET, 'pollurlname', false));
 }
-catch(Exceptions\SeException $ex){
+catch(Exceptions\SeException){
 	Template::Emit404();
 }
 
diff --git a/www/polls/votes/new.php b/www/polls/votes/new.php
index 4bebcfe1..33129c0f 100644
--- a/www/polls/votes/new.php
+++ b/www/polls/votes/new.php
@@ -29,7 +29,7 @@ try{
 		// Vote was found, don't allow another vote
 		throw new Exceptions\PollVoteExistsException($vote);
 	}
-	catch(Exceptions\InvalidPollVoteException $ex){
+	catch(Exceptions\InvalidPollVoteException){
 		// Vote was not found, user is OK to vote
 	}
 
@@ -38,10 +38,10 @@ try{
 		session_unset();
 	}
 }
-catch(Exceptions\LoginRequiredException $ex){
+catch(Exceptions\LoginRequiredException){
 	Template::RedirectToLogin();
 }
-catch(Exceptions\InvalidPollException $ex){
+catch(Exceptions\InvalidPollException){
 	Template::Emit404();
 }
 catch(Exceptions\PollVoteExistsException $ex){
diff --git a/www/webhooks/github.php b/www/webhooks/github.php
index 4c7b0d56..d7ec1515 100644
--- a/www/webhooks/github.php
+++ b/www/webhooks/github.php
@@ -133,7 +133,7 @@ try{
 	// "Success, no content"
 	http_response_code(204);
 }
-catch(Exceptions\InvalidCredentialsException $ex){
+catch(Exceptions\InvalidCredentialsException){
 	// "Forbidden"
 	http_response_code(403);
 }
@@ -149,7 +149,7 @@ catch(Exceptions\WebhookException $ex){
 	// "Client error"
 	http_response_code(400);
 }
-catch(Exceptions\NoopException $ex){
+catch(Exceptions\NoopException){
 	// We arrive here because a special case required us to take no action for the request, but execution also had to be interrupted.
 	// For example, we received a request for a known repo for which we must ignore requests.
 
diff --git a/www/webhooks/postmark.php b/www/webhooks/postmark.php
index a1fa430c..c1c978e4 100644
--- a/www/webhooks/postmark.php
+++ b/www/webhooks/postmark.php
@@ -79,7 +79,7 @@ try{
 	// "Success, no content"
 	http_response_code(204);
 }
-catch(Exceptions\InvalidCredentialsException $ex){
+catch(Exceptions\InvalidCredentialsException){
 	// "Forbidden"
 	$log->Write('Invalid key: ' . ($_SERVER['HTTP_X_SE_KEY'] ?? ''));
 	http_response_code(403);
diff --git a/www/webhooks/zoho.php b/www/webhooks/zoho.php
index d2f9d101..99e6ebc8 100644
--- a/www/webhooks/zoho.php
+++ b/www/webhooks/zoho.php
@@ -56,7 +56,7 @@ try{
 	// "Success, no content"
 	http_response_code(204);
 }
-catch(Exceptions\InvalidCredentialsException $ex){
+catch(Exceptions\InvalidCredentialsException){
 	// "Forbidden"
 	$log->Write('Couldn\'t validate POST data.');
 	http_response_code(403);