diff --git a/ignite/engine/engine.py b/ignite/engine/engine.py
index 3f97a3035c7..bb2f9bfae05 100644
--- a/ignite/engine/engine.py
+++ b/ignite/engine/engine.py
@@ -812,11 +812,7 @@ def _run_once_on_dataset(self) -> float:
                     # Should exit while loop if we can not iterate
                     if should_exit:
                         if not self._is_done(self.state):
-                            total_iters = (
-                                self.state.epoch_length * self.state.max_epochs
-                                if self.state.max_epochs is not None
-                                else self.state.max_iters
-                            )
+                            total_iters = self.state.epoch_length * self.state.max_epochs  # type: ignore[operator]
 
                             warnings.warn(
                                 "Data iterator can not provide data anymore but required total number of "
diff --git a/ignite/handlers/checkpoint.py b/ignite/handlers/checkpoint.py
index ed3b430bfc9..0e275a9ed4a 100644
--- a/ignite/handlers/checkpoint.py
+++ b/ignite/handlers/checkpoint.py
@@ -797,7 +797,7 @@ def __init__(
         self,
         dirname: str,
         filename_prefix: str,
-        save_interval: Optional[Callable] = None,
+        save_interval: Optional[int] = None,
         score_function: Optional[Callable] = None,
         score_name: Optional[str] = None,
         n_saved: Union[int, None] = 1,
diff --git a/mypy.ini b/mypy.ini
index 58fa118fd9e..2ee582b37eb 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -65,3 +65,6 @@ ignore_missing_imports = True
 
 [mypy-tqdm.*]
 ignore_missing_imports = True
+
+[mypy-ignite.contrib.handlers.custom_events]
+ignore_errors = True
\ No newline at end of file