diff --git a/ext/upload/main.php b/ext/upload/main.php
index cd0d782d..7aa2aa33 100644
--- a/ext/upload/main.php
+++ b/ext/upload/main.php
@@ -69,6 +69,8 @@ class Upload extends Extension {
 	private function try_upload($file, $tags, $source) {
 		global $page;
 		global $config;
+		
+		if(empty($source)) $source = null;
 
 		$ok = false;