diff --git a/core/modules/contextual/js/contextual.js b/core/modules/contextual/js/contextual.js
index 31f4c83918..8c67eae70f 100644
--- a/core/modules/contextual/js/contextual.js
+++ b/core/modules/contextual/js/contextual.js
@@ -157,8 +157,10 @@
       // Collect the IDs for all contextual links placeholders.
       var ids = [];
       $placeholders.each(function () {
-        if ($.inArray($(this).attr('data-contextual-id'), ids) < 0)
-        ids.push($(this).attr('data-contextual-id'));
+        // Add the contextual link ID if it hasn't been added already.
+        if ($.inArray($(this).attr('data-contextual-id'), ids) < 0) {
+          ids.push($(this).attr('data-contextual-id'));
+        }
       });
 
       // Update all contextual links placeholders whose HTML is cached.