diff --git a/src/main/java/club/joylink/xiannccda/ats/message/FrameSchema.java b/src/main/java/club/joylink/xiannccda/ats/message/FrameSchema.java
index ea08136..252680b 100644
--- a/src/main/java/club/joylink/xiannccda/ats/message/FrameSchema.java
+++ b/src/main/java/club/joylink/xiannccda/ats/message/FrameSchema.java
@@ -145,6 +145,10 @@ public class FrameSchema {
     if (messageId.equals(MessageId.UNKNOWN)) {
       throw new Exception("位置的消息id");
     }
+    if (messageId.omc == null || messageId.omc.create() == null) {
+      throw new Exception(
+          String.format("id=%s的消息没有消息对象创建接口omc或接口返回null", messageId));
+    }
     MessageData message = messageId.omc.create();
     message.decode(msgBuf);
     messages.add(message);
diff --git a/src/main/java/club/joylink/xiannccda/ats/message/MessageId.java b/src/main/java/club/joylink/xiannccda/ats/message/MessageId.java
index 7eca067..926bfb6 100644
--- a/src/main/java/club/joylink/xiannccda/ats/message/MessageId.java
+++ b/src/main/java/club/joylink/xiannccda/ats/message/MessageId.java
@@ -34,6 +34,9 @@ public enum MessageId {
   DEPOT_PLAN(0x0007, null);
 
   int val;
+  /**
+   * 消息对象创建接口
+   */
   OccMessageCreate omc;
 
   interface OccMessageCreate {