Django's delete method does not accept unknown keywords
diff --git a/planetstack/core/models/plcorebase.py b/planetstack/core/models/plcorebase.py
index 289bd49..446245b 100644
--- a/planetstack/core/models/plcorebase.py
+++ b/planetstack/core/models/plcorebase.py
@@ -87,6 +87,7 @@
             pass
             
         if (purge):
+            del kwds['purge']
             super(PlCoreBase, self).delete(*args, **kwds)
         else:
             self.deleted = True