Index: ApiEditPage.php
===================================================================
--- ApiEditPage.php	(revision 58637)
+++ ApiEditPage.php	(working copy)
@@ -56,8 +56,9 @@
 			$this->dieUsageMsg(array('sessionfailure'));
 
 		$titleObj = Title::newFromText($params['title']);
-		if(!$titleObj)
+		if(!$titleObj || $titleObj->isExternal())
 			$this->dieUsageMsg(array('invalidtitle', $params['title']));
+			
 		// Some functions depend on $wgTitle == $ep->mTitle
 		global $wgTitle;
 		$wgTitle = $titleObj;