diff --git a/frontends/src/quick_frontend/quick_widgets.py b/frontends/src/quick_frontend/quick_widgets.py
index 5cc9b9e9..72f42175 100644
--- a/frontends/src/quick_frontend/quick_widgets.py
+++ b/frontends/src/quick_frontend/quick_widgets.py
@@ -195,7 +195,7 @@ class QuickWidgetsManager(object):
                 new_kwargs['on_existing_widget'] = C.WIDGET_RAISE
                 hash_idx = 1
                 while True:
-                    new_kwargs['force_hash'] = hash_ + "_new_instance_{}".format(hash_idx)
+                    new_kwargs['force_hash'] = "{}_new_instance_{}".format(hash_, hash_idx)
                     try:
                         widget = self.getOrCreateWidget(class_, target, *args, **new_kwargs)
                     except WidgetAlreadyExistsError: