1 files changed, 3 insertions, 1 deletions

diff --git a/git_trace2_event_log.py b/git_trace2_event_log.py
index 820cbac0..46bd5e4b 100644
--- a/git_trace2_event_log.py
+++ b/git_trace2_event_log.py
@@ -198,9 +198,11 @@ class EventLog(object):
             event["value"] = value
             self._log.append(event)
 
-    def ErrorEvent(self, msg, fmt):
+    def ErrorEvent(self, msg, fmt=None):
         """Append a 'error' event to the current log."""
         error_event = self._CreateEventDict("error")
+        if fmt is None:
+            fmt = msg
         error_event["msg"] = msg
         error_event["fmt"] = fmt
         self._log.append(error_event)