# django__django-15061
# Loki Mode Multi-Agent Patch
# Attempts: 1

--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -849,9 +849,9 @@ class MultiWidget(Widget):
         return id_
 
     def id_for_label(self, id_, index=None):
-        if index is None:
-            index = '0'
-        return '%s_%s' % (id_, index) if id_ else id_
+        if index is not None:
+            return '%s_%s' % (id_, index) if id_ else id_
+        return ''
 
     def value_from_datadict(self, data, files, name):
         return [