diff --git a/supervisor/ingress.py b/supervisor/ingress.py
index 29724b54e..a5279c71e 100644
--- a/supervisor/ingress.py
+++ b/supervisor/ingress.py
@@ -109,7 +109,7 @@ class Ingress(FileConfiguration, CoreSysAttributes):
     def validate_session(self, session: str) -> bool:
         """Return True if session valid and make it longer valid."""
         if session not in self.sessions:
-            _LOGGER.debug("Session %f is not known", session)
+            _LOGGER.debug("Session %s is not known", session)
             return False
 
         # check if timestamp valid, to avoid crash on malformed timestamp