diff --git a/lib/Exceptions/LocSubjectNameRequiredException.php b/lib/Exceptions/LocSubjectNameRequiredException.php
new file mode 100644
index 00000000..ae35dd65
--- /dev/null
+++ b/lib/Exceptions/LocSubjectNameRequiredException.php
@@ -0,0 +1,7 @@
+<?
+namespace Exceptions;
+
+class LocSubjectNameRequiredException extends AppException{
+	/** @var string $message */
+	protected $message = 'LocSubject name is required.';
+}
diff --git a/lib/LocSubject.php b/lib/LocSubject.php
index 7db6f231..935dd35c 100644
--- a/lib/LocSubject.php
+++ b/lib/LocSubject.php
@@ -9,6 +9,11 @@ class LocSubject{
 	public function Validate(): void{
 		$error = new Exceptions\ValidationException();
 
+		$this->Name = trim($this->Name ?? '');
+		if($this->Name == ''){
+			$error->Add(new Exceptions\LocSubjectNameRequiredException());
+		}
+
 		if(strlen($this->Name) > EBOOKS_MAX_STRING_LENGTH){
 			$error->Add(new Exceptions\StringTooLongException('LoC subject: '. $this->Name));
 		}