diff --git a/protocol/src/main/java/com/zfoo/protocol/serializer/protobuf/GeneratePbUtils.java b/protocol/src/main/java/com/zfoo/protocol/serializer/protobuf/GeneratePbUtils.java
index d7cc5f57..a2d34229 100644
--- a/protocol/src/main/java/com/zfoo/protocol/serializer/protobuf/GeneratePbUtils.java
+++ b/protocol/src/main/java/com/zfoo/protocol/serializer/protobuf/GeneratePbUtils.java
@@ -87,7 +87,7 @@ public abstract class GeneratePbUtils {
                             , protocolId, pair.getKey().getName(), pair.getValue().getName(), proto.getName(), protocolName));
                 }
                 if (protocolNameMap.containsKey(protocolName)) {
-                    var pair = protocolIdMap.get(protocolId);
+                    var pair = protocolNameMap.get(protocolName);
                     throw new RuntimeException(StringUtils.format("duplicate protocol name in [{}]:[{}] and [{}]:[{}]"
                             , pair.getKey().getName(), pair.getValue().getName(), proto.getName(), protocolName));
                 }
diff --git a/protocol/src/test/protobuf/one_message.proto b/protocol/src/test/protobuf/one_message.proto
index 2d989964..e7881c7d 100644
--- a/protocol/src/test/protobuf/one_message.proto
+++ b/protocol/src/test/protobuf/one_message.proto
@@ -5,7 +5,7 @@ package test.message;
 
 option java_package = "io.edap.protobuf.test.message.v3";
 
-// start_protocol_id = 200
+// start_protocol_id = 300
 
 message OneMessage {
   Proj value = 1;