Version 5.0.0 beta 3

system/Content/Content.php

@@ -1435,12 +1435,18 @@ abstract class Content extends ActiveRecord
 	/**
 	 * Get quote and mention notifications
 	 *
-	 * @param	string	$content	The content
+	 * @param	string|null	$content	The content
 	 * @return	array	array( 'quotes' => array( ... member IDs ... ), 'mentions' => array( ... member IDs ... ), 'embeds' => array( ... member IDs ... )  )
 	 */
-	protected static function _getQuoteAndMentionIdsFromContent( string $content ): array
+	protected static function _getQuoteAndMentionIdsFromContent( ?string $content ): array
 	{
 		$return = array( 'quotes' => array(), 'mentions' => array(), 'embeds' => array() );
+
+		/* If we have no content, don't bother with this */
+		if( empty( $content ) )
+		{
+			return $return;
+		}
 		
 		$document = new DOMDocument( '1.0', 'UTF-8' );
 		if ( @$document->loadHTML( DOMDocument::wrapHtml( '<div>' . $content . '</div>' ) ) !== FALSE )