changes: Fixed crash on disconnect when there are more than one client connected.

models/changes/subscribe.go

@@ -40,6 +40,7 @@ func Subscribe(ctx context.Context, keys []models.ChangeKey, wildcard bool) <-ch
 		for i := range subList {
 			if subList[i] == sub {
 				subList = append(subList[:i], subList[i+1:]...)
+				break
 			}
 		}
 		subMutex.Unlock()