From 85a31335e2d4790ab1f4d17f610784c0bcb9d4fe Mon Sep 17 00:00:00 2001
From: JustOff <Off.Just.Off@gmail.com>
Date: Fri, 4 May 2018 18:24:47 +0300
Subject: [PATCH] [PMkit] Fix Empty string passed to getElementById() warning
 in buttons.js

---
 toolkit/jetpack/sdk/ui/buttons.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/toolkit/jetpack/sdk/ui/buttons.js b/toolkit/jetpack/sdk/ui/buttons.js
index 66e0fd742d..6aaed3865d 100644
--- a/toolkit/jetpack/sdk/ui/buttons.js
+++ b/toolkit/jetpack/sdk/ui/buttons.js
@@ -50,7 +50,7 @@ function insertButton(aWindow, id, onBuild) {
   let toolbar = toolbarId != "" && doc.getElementById(toolbarId);
 
   if (toolbar) {
-    let nextItem = doc.getElementById(nextItemId);
+    let nextItem = nextItemId != "" && doc.getElementById(nextItemId);
     // If nextItem not in toolbar then retrieve it by reading currentset attribute
     if (!(nextItem && nextItem.parentNode && nextItem.parentNode.id == toolbarId)) {
       nextItem = null;