diff --git a/royalnet/engineer/pda/implementations/base.py b/royalnet/engineer/pda/implementations/base.py
index d937afa2..e76bd5fc 100644
--- a/royalnet/engineer/pda/implementations/base.py
+++ b/royalnet/engineer/pda/implementations/base.py
@@ -244,7 +244,7 @@ class ConversationListImplementation(PDAImplementation, metaclass=abc.ABCMeta):
 
         msg = [
             f"Unhandled {etype.__qualname__} in {conv!r} running in {dispenser!r}: {exception!r}",
-            traceback.format_tb(etb),
+            *traceback.format_tb(etb),
         ]
         self.log.error("\n".join(msg))