diff --git a/www/ebooks/author.php b/www/ebooks/author.php
index 43b3ed79..c22c5a2b 100644
--- a/www/ebooks/author.php
+++ b/www/ebooks/author.php
@@ -16,7 +16,7 @@ try{
 		throw new InvalidAuthorException();
 	}
 }
-catch(\Exception $ex){
+catch(InvalidAuthorException $ex){
 	http_response_code(404);
 	include(WEB_ROOT . '/404.php');
 	exit();
diff --git a/www/ebooks/ebook.php b/www/ebooks/ebook.php
index 7b726d61..d7221508 100644
--- a/www/ebooks/ebook.php
+++ b/www/ebooks/ebook.php
@@ -65,7 +65,7 @@ catch(SeeOtherEbookException $ex){
 	header('Location: ' . $ex->Url);
 	exit();
 }
-catch(\Exception $ex){
+catch(InvalidEbookException $ex){
 	http_response_code(404);
 	include(WEB_ROOT . '/404.php');
 	exit();
diff --git a/www/ebooks/index.php b/www/ebooks/index.php
index a6c2f499..ea6b933e 100644
--- a/www/ebooks/index.php
+++ b/www/ebooks/index.php
@@ -127,7 +127,7 @@ try{
 
 	$queryString = preg_replace('/^&/ius', '', $queryString);
 }
-catch(\Exception $ex){
+catch(InvalidCollectionException $ex){
 	http_response_code(404);
 	include(WEB_ROOT . '/404.php');
 	exit();