fix: adding nil checker

v1/client/client.go

@@ -217,9 +217,11 @@ func (wsClient *SafeWebsocketClient) connect() error {
 	wsClient.conn = conn
 	wsClient.isConnected = true
 
+	if wsClient.authenticateFn != nil {
 		if err := wsClient.authenticateFn(); err != nil {
 			return err
 		}
+	}
 
 	wsClient.mu.WriteHandler(func() error {