diff --git a/app.go b/app.go
index 9eb52d81b1..3c48b8b263 100644
--- a/app.go
+++ b/app.go
@@ -162,6 +162,7 @@ func NewHeadscale(cfg *Config) (*Headscale, error) {
 		aclRules:           tailcfg.FilterAllowAll, // default allowall
 		registrationCache:  registrationCache,
 		pollNetMapStreamWG: sync.WaitGroup{},
+		lastStateChange:    xsync.NewMapOf[time.Time](),
 	}
 
 	err = app.initDB()