Fix mypy error

darrenburns · Jun 25, 2021 · c911658 · c911658
1 parent 57ef2e1
commit c911658
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ward/expect.py b/ward/expect.py
@@ -38,7 +38,7 @@ def __exit__(
         exc_val: Optional[BaseException],
         exc_tb: Optional[types.TracebackType],
     ) -> bool:
-        if not issubclass(exc_type, self.expected_ex_type):
+        if exc_type and not issubclass(exc_type, self.expected_ex_type):
             raise AssertionError(
                 f"Expected exception {self.expected_ex_type}, but {exc_type} was raised instead."
             )