diff --git a/src/if_py_both.h b/src/if_py_both.h
index 6ea0aff..7485779 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -1624,6 +1624,9 @@
     PyObject	*rObj = _DictionaryItem(self, keyObject, DICT_FLAG_RETURN_BOOL);
     int		ret;
 
+    if (rObj == NULL)
+	return -1;
+
     ret = (rObj == Py_True);
 
     Py_DECREF(rObj);