diff --git a/stateless_uptime_kuma/uptime_kuma.py b/stateless_uptime_kuma/uptime_kuma.py
index 742b385..10f1f0f 100644
--- a/stateless_uptime_kuma/uptime_kuma.py
+++ b/stateless_uptime_kuma/uptime_kuma.py
@@ -138,9 +138,11 @@ class Monitor(Item):
                 (i["tag_id"], i["value"]) for i in self.api.get_monitor(self.id)["tags"]
             )
             for t, v in self.tags:
+                if v is None:
+                    v = ""
                 if (t.id, v) not in current_tags:
                     logger.debug(f"Adding tag: '{t}, {v}'")
-                    self.api.add_monitor_tag(tag_id=t.id, monitor_id=self.id, value=v if v is not None else "")
+                    self.api.add_monitor_tag(tag_id=t.id, monitor_id=self.id, value=v)
         self.saved = True
 
     def __repr__(self):