diff --git a/lib/client/edit.js b/lib/client/edit.js
index cc8b3089..10210230 100644
--- a/lib/client/edit.js
+++ b/lib/client/edit.js
@@ -492,7 +492,7 @@ var CloudCmd, Util, DOM, CloudFunc, ace, DiffProto, diff_match_patch, Zip, MenuI
         function onSave(text) {
             var ret,
                 size    = Format.size(Value.length),
-                isError = Util.isContainStrAtBegin(text, 'error'),
+                isError = /^error/.test(text),
                 path    = Info.path,
                 msg     = '\nShould I save file anyway?';