diff --git a/tractor/_supervise.py b/tractor/_supervise.py
index d9bcbab..b8c8567 100644
--- a/tractor/_supervise.py
+++ b/tractor/_supervise.py
@@ -301,7 +301,7 @@ async def _open_and_supervise_one_cancels_all_nursery(
 ) -> typing.AsyncGenerator[ActorNursery, None]:
 
     # the collection of errors retreived from spawned sub-actors
-    errors: dict[tuple[str, str], Exception] = {}
+    errors: dict[tuple[str, str], BaseException] = {}
 
     # This is the outermost level "deamon actor" nursery. It is awaited
     # **after** the below inner "run in actor nursery". This allows for
@@ -310,7 +310,6 @@ async def _open_and_supervise_one_cancels_all_nursery(
     # actors spawned in "daemon mode" (aka started using
     # ``ActorNursery.start_actor()``).
 
-    err: BaseExpection | None = None
     # errors from this daemon actor nursery bubble up to caller
     async with trio.open_nursery() as da_nursery:
         try:
@@ -412,9 +411,9 @@ async def _open_and_supervise_one_cancels_all_nursery(
             BaseExceptionGroup,
             trio.Cancelled
 
-        ) as err:
-
+        ) as err:  # noqa
             errors[actor.uid] = err
+
             # XXX: yet another guard before allowing the cancel
             # sequence in case a (single) child is in debug.
             await maybe_wait_for_debugger(