Merge branch 'develop' of github.com:octobercms/october into develop

modules/backend/classes/WidgetBase.php

@@ -131,6 +131,8 @@ abstract class WidgetBase
         if ($suffix !== null)
             $id .= '-' . $suffix;
 
+        $id = rtrim(str_replace(['[', ']'], '-', $id), '-');
+
         return $id;
     }
 
@@ -248,4 +250,4 @@ abstract class WidgetBase
         Session::forget($sessionId);
     }
 
-}
+}