diff --git a/lib/server/rest.js b/lib/server/rest.js
index 9c96f9ae..7f7181df 100644
--- a/lib/server/rest.js
+++ b/lib/server/rest.js
@@ -92,11 +92,11 @@
     }
     
     function onFS(pParams){
-        var lWriteStream, lSize,
+        var p, lWriteStream, lSize, lQuery,
             lRet = main.checkParams(pParams);
         if(lRet){
-            var p       = pParams,
-                lQuery  = main.getQuery(p.request);
+            p       = pParams,
+            lQuery  = main.getQuery(p.request);
             
             p.name  = Util.removeStrOneTime(p.name, CloudFunc.FS) || '/';
             switch(p.request.method){
@@ -148,14 +148,19 @@
                                 if (pError)
                                     main.sendError(pParams, pError);
                                 else {
-                                    lDiff = diff.applyPatch(lStr, pPatch);
-                                    
-                                    fs.writeFile(p.name, lDiff, function(){  
-                                        if (pError)
-                                            main.sendError(pParams, pError);
-                                        else
-                                            main.sendResponse(pParams, 'writed: ' + p.name);
+                                    var lRet = Util.tryCatchLog(function(){
+                                        lDiff = diff.applyPatch(lStr, pPatch);
                                     });
+                                    
+                                    if (lDiff && !lRet)
+                                        fs.writeFile(p.name, lDiff, function(){  
+                                            if (pError)
+                                                main.sendError(pParams, pError);
+                                            else
+                                                main.sendResponse(pParams, 'writed: ' + p.name);
+                                        });
+                                    else
+                                        main.sendError(pParams, lRet || lDiff);
                                 }
                             });
                         });