Version 4.6.0

applications/calendar/setup/upg_105013/upgrade.php

@@ -46,7 +46,14 @@ class _Upgrade
 
 			$did++;
 
-			$recurrenceRule = \IPS\calendar\Icalendar\ICSParser::parseRrule( $event['event_recurring'], 'UTC' );
+			try
+			{
+				$recurrenceRule = \IPS\calendar\Icalendar\ICSParser::parseRrule( $event['event_recurring'], 'UTC' );
+			}
+			catch( \InvalidArgumentException $e )
+			{
+				continue;
+			}
 
 			$endDate = NULL;