diff --git a/lib/storage/blob.js b/lib/storage/blob.js
index 172af2e1a..b029b95c5 100644
--- a/lib/storage/blob.js
+++ b/lib/storage/blob.js
@@ -153,8 +153,12 @@ var clearActivity = function (Env, blobId, cb) {
 };
 var updateActivity = function (Env, blobId, cb) {
     var path = makeActivityPath(Env, blobId);
-    var s_data = String(+new Date());
-    Fs.writeFile(path, s_data, cb);
+    var blobPath = makeBlobPath(Env, blobId);
+    isFile(blobPath, (err, state) => {
+        if (err || !state) { return void cb(); }
+        var s_data = String(+new Date());
+        Fs.writeFile(path, s_data, cb);
+    });
 };
 
 var archiveActivity = function (Env, blobId, cb) {