diff --git a/src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMServerFactory.java b/src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMServerFactory.java
index 8c84133f..0a1d6e6a 100755
--- a/src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMServerFactory.java
+++ b/src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMServerFactory.java
@@ -165,7 +165,7 @@ public class ZLMServerFactory {
                                          String deviceId, String channelId, boolean tcp, boolean rtcp){
 
         int localPort = sendRtpPortManager.getNextPort(serverItem);
-        if (localPort == 0) {
+        if (localPort <= 0) {
             return null;
         }
         SendRtpItem sendRtpItem = new SendRtpItem();