diff --git a/selfdrive/manager/process.py b/selfdrive/manager/process.py
index 93ffc98..ba51c6f 100755
--- a/selfdrive/manager/process.py
+++ b/selfdrive/manager/process.py
@@ -44,7 +44,7 @@ def launcher(proc: str, name: str, log_path: str) -> None:
   except Exception as e:
     # can't install the crash handler because sys.excepthook doesn't play nice
     # with threads, so catch it here.
-    with open(log_path, 'a') as file: file.write(e+"\n")
+    with open(log_path, 'a') as file: file.write(str(e)+"\n")
     sentry.capture_exception()
     raise