diff --git a/src/mudlib/embedded_if_session.py b/src/mudlib/embedded_if_session.py
index 2e93f90..79aa40e 100644
--- a/src/mudlib/embedded_if_session.py
+++ b/src/mudlib/embedded_if_session.py
@@ -2,6 +2,7 @@ import asyncio
 import logging
 import re
 import threading
+import traceback
 from pathlib import Path
 from typing import TYPE_CHECKING
 
@@ -118,7 +119,8 @@ class EmbeddedIFSession:
         except ZCpuRestart:
             logger.debug("Interpreter restart requested")
         except Exception as e:
-            logger.error(f"Interpreter crashed: {e}")
+            tb = traceback.format_exc()
+            logger.error(f"Interpreter crashed:\n{tb}")
             self._error = f"interpreter error: {e}"
         finally:
             self._done = True