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--- a/ForgeUserStats/forgeuserstats/model/stats.py
+++ b/ForgeUserStats/forgeuserstats/model/stats.py
@@ -182,7 +182,7 @@
         if i is None:
             return dict(created=0, modified=0)
         cat = self.general[i]
-        j = getElementIndex(cat.messages, art_type = art_type)
+        j = getElementIndex(cat.messages, messagetype = art_type)
         if j is None:
             return dict(created=0, modified=0)
         return dict(created=cat.messages[j].created, modified=cat.messages[j].modified)