diff --git a/seqlog/structured_logging.py b/seqlog/structured_logging.py
index c6596ac..3e091bb 100644
--- a/seqlog/structured_logging.py
+++ b/seqlog/structured_logging.py
@@ -158,7 +158,7 @@ def getMessage(self):
         elif self.log_props:
             try:
                 return self.msg.format(**self.log_props)
-            except (KeyError, IndexError):
+            except (KeyError, IndexError, ValueError):
                 # IndexError because sometimes the wrong log messages go like {existing_prop[0]}
                 return self.msg   # handle the situation where we have braces in the logging value
         else: