diff --git a/src/main/java/cn/nukkit/command/Command.java b/src/main/java/cn/nukkit/command/Command.java
index fbbd4954eb7..4fa618b27e5 100644
--- a/src/main/java/cn/nukkit/command/Command.java
+++ b/src/main/java/cn/nukkit/command/Command.java
@@ -211,7 +211,7 @@ public boolean unregister(CommandMap commandMap) {
     }
 
     public boolean allowChangesFrom(CommandMap commandMap) {
-        return commandMap != null && !commandMap.equals(this.commandMap);
+        return this.commandMap == null || this.commandMap.equals(commandMap);
     }
 
     public boolean isRegistered() {