diff --git a/moderation/importers/moderation.py b/moderation/importers/moderation.py
index 090f47c..addf85b 100644
--- a/moderation/importers/moderation.py
+++ b/moderation/importers/moderation.py
@@ -69,7 +69,7 @@ class ImportModerationView(ui.View):
             if 'metadata' not in case or not case['metadata']:
                 case['metadata'] = {}
 
-            if duration != 'NULL':
+            if case['duration'] != 'NULL':
                 duration_t = datetime.strptime(case['duration'], "%H:%M:%S")
                 duration = timedelta(
                     hours=duration_t.hours,