diff --git a/lib/client/edit.js b/lib/client/edit.js
index a2a00954..c624ea60 100644
--- a/lib/client/edit.js
+++ b/lib/client/edit.js
@@ -354,7 +354,7 @@ var CloudCmd, Util, DOM, CloudFunc, io, ace, DiffProto, diff_match_patch, Zip, M
                 exec.if(!isDiff, function(patch) {
                     var query           = '',
                         MAX_SIZE        = CloudFunc.MAX_FILE_SIZE,
-                        patchLength     = patch.length,
+                        patchLength     = patch && patch.length || 0,
                         length          = Value.length,
                         isLessMaxLength = length < MAX_SIZE,
                         isLessLength    = isLessMaxLength && patchLength < length,