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-rw-r--r--toolkit/jetpack/sdk/ui/buttons.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/toolkit/jetpack/sdk/ui/buttons.js b/toolkit/jetpack/sdk/ui/buttons.js
index 66e0fd742..6aaed3865 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;