diff --git a/src/main/java/net/lamgc/cgj/bot/boot/BotGlobal.java b/src/main/java/net/lamgc/cgj/bot/boot/BotGlobal.java
index d9d9a31..467555b 100644
--- a/src/main/java/net/lamgc/cgj/bot/boot/BotGlobal.java
+++ b/src/main/java/net/lamgc/cgj/bot/boot/BotGlobal.java
@@ -27,7 +27,7 @@ public final class BotGlobal {
 
     public static BotGlobal getGlobal() {
         if(instance == null) {
-            throw new IllegalStateException("");
+            throw new IllegalStateException("BotGlobal has not been initialized");
         }
         return instance;
     }