index: guard mutation result auto-insert-id

Author: proppy

lib/datastore/index.js

@@ -195,9 +195,9 @@ Transaction.prototype.saveAll = function(keys, objs, callback) {
     if (err || !resp) {
       return callback(err);
     }
-    var keys = [], i = 0;
-    resp.mutationResult.insertAutoIdKeys.forEach(function(item) {
-      keys[i++] = entity.keyFromKeyProto(item);
+    var keys = [];
+    resp.mutationResult.insertAutoIdKeys && resp.mutationResult.insertAutoIdKeys.forEach(function(item) {
+      keys.push(entity.keyFromKeyProto(item));
     });
     callback(null, keys);
   });