diff --git a/mininterface/auxiliary.py b/mininterface/auxiliary.py
index d7c19fb..bd8cf8a 100644
--- a/mininterface/auxiliary.py
+++ b/mininterface/auxiliary.py
@@ -133,6 +133,7 @@ def subclass_matches_annotation(cls, annotation) -> bool:
         return issubclass(cls, annotation)  # TODO tuple[int, str] is not a class
     except Exception:
         print("135: cls, annotation", cls, " ––– ", annotation)  # TODO
+        raise
 
 
 def serialize_structure(obj):