diff --git a/snf-astakos-app/astakos/quotaholder_app/callpoint.py b/snf-astakos-app/astakos/quotaholder_app/callpoint.py
index 3344e683eb1eeb9713d8a00f2e1cc9e86af506fa..212c976d4f44697c9c6fc2d962c1f6db4e550085 100644
--- a/snf-astakos-app/astakos/quotaholder_app/callpoint.py
+++ b/snf-astakos-app/astakos/quotaholder_app/callpoint.py
@@ -259,7 +259,7 @@ def resolve_pending_commissions(clientkey, accept_set=None, reject_set=None,
             key = pv.holding_key()
             h = holdings.get(key)
             if h is None:
-                raise CorruptedError("Corrupted provision '%s'" % key)
+                raise CorruptedError("Corrupted provision '%s'" % str(key))
 
             provision_ids.append(pv.id)
             quantity = pv.quantity