Index: branches/5.2.x/core/admin_templates/js/uploader/upload_manager.js
===================================================================
diff -u -N -r15729 -r15733
--- branches/5.2.x/core/admin_templates/js/uploader/upload_manager.js	(.../upload_manager.js)	(revision 15729)
+++ branches/5.2.x/core/admin_templates/js/uploader/upload_manager.js	(.../upload_manager.js)	(revision 15733)
@@ -119,7 +119,7 @@
 	var $uploader = this._Uploaders[uploader_id];
 
 	$.get(
-		$uploader.deleteURL.replace('#FILE#', encodeURIComponent(fname)).replace('#FIELD#', $uploader.params.field),
+		$uploader.deleteURL.replace('#FILE#', encodeURIComponent(fname)).replace('#FIELD_ID#', $uploader.id),
 		function ($data) {
 			$uploader.removeFile({id:fname});
 			$uploader.deleted.push(fname);