Fix unsafe "instanceof" negations

https://github.com/MoonchildProductions/Pale-Moon/pull/1173

1 files changed, 2 insertions, 2 deletions

diff --git a/services/sync/modules/record.js b/services/sync/modules/record.js
index 02f7f281a..f7a69d9ef 100644
--- a/services/sync/modules/record.js
+++ b/services/sync/modules/record.js
@@ -43,7 +43,7 @@ WBORecord.prototype = {
   // Get thyself from your URI, then deserialize.
   // Set thine 'response' field.
   fetch: function fetch(resource) {
-    if (!resource instanceof Resource) {
+    if (!(resource instanceof Resource)) {
       throw new Error("First argument must be a Resource instance.");
     }
 
@@ -56,7 +56,7 @@ WBORecord.prototype = {
   },
 
   upload: function upload(resource) {
-    if (!resource instanceof Resource) {
+    if (!(resource instanceof Resource)) {
       throw new Error("First argument must be a Resource instance.");
     }