Version 4.3.0

system/Helpers/Form/Url.php

@@ -68,7 +68,7 @@ class _Url extends Text
 			}
 			
 			/* And that it's an allowed protocol */
-			if ( !in_array( mb_strtolower( $value->data['scheme'] ), $this->options['allowedProtocols'] ) )
+			if ( $this->options['allowedProtocols'] and !in_array( mb_strtolower( $value->data['scheme'] ), $this->options['allowedProtocols'] ) )
 			{
 				throw new \DomainException('form_url_bad_protocol');
 			}