diff --git a/third_party/electrical_machinery/electrical_machinery.go b/third_party/electrical_machinery/electrical_machinery.go
index a4f6442..cb3b196 100644
--- a/third_party/electrical_machinery/electrical_machinery.go
+++ b/third_party/electrical_machinery/electrical_machinery.go
@@ -134,6 +134,7 @@ func initEMMsg(trainState *state_proto.TrainState) map[int]*message.ElectricMach
 }
 
 func (s *electricalMachineryImpl) initElectricalMachinery() {
+	s.electricalMachineryUdpClientMap = map[int]udp.UdpClient{}
 	for _, c := range s.runConfig {
 		if &c != nil && c.Ip != "" && c.Open {
 			ep := PointA