diff --git a/C#.NET/source/Yitter.IdGenerator/YitIdHelper.cs b/C#.NET/source/Yitter.IdGenerator/YitIdHelper.cs
index 5633df3..cb48892 100644
--- a/C#.NET/source/Yitter.IdGenerator/YitIdHelper.cs
+++ b/C#.NET/source/Yitter.IdGenerator/YitIdHelper.cs
@@ -34,7 +34,6 @@ namespace Yitter.IdGenerator
         /// <summary>
         /// 生成新的Id
         /// 调用本方法前，请确保调用了 SetIdGenerator 方法做初始化。
-        /// 否则将会初始化一个WorkerId为1的对象。
         /// </summary>
         /// <returns></returns>
         public static long NextId()
@@ -52,6 +51,8 @@ namespace Yitter.IdGenerator
             //    }
             //}
 
+            if (_IdGenInstance == null) throw new ApplicationException("Please initialize Yitter.IdGeneratorOptions first.");
+
             return _IdGenInstance.NewLong();
         }
 
diff --git a/Go/source/idgen/YitIdHelper.go b/Go/source/idgen/YitIdHelper.go
index a444b0a..3cc3cc1 100644
--- a/Go/source/idgen/YitIdHelper.go
+++ b/Go/source/idgen/YitIdHelper.go
@@ -32,7 +32,9 @@ func NextId() int64 {
 	//		idGenerator = NewDefaultIdGenerator(options)
 	//	}
 	//}
-
+	if idGenerator == nil {
+		panic("Please initialize Yitter.IdGeneratorOptions first.")
+	}
 	return idGenerator.NewLong()
 }
 
diff --git a/Java/source/src/main/java/com/github/yitter/idgen/YitIdHelper.java b/Java/source/src/main/java/com/github/yitter/idgen/YitIdHelper.java
index 868ce02..b501d0b 100644
--- a/Java/source/src/main/java/com/github/yitter/idgen/YitIdHelper.java
+++ b/Java/source/src/main/java/com/github/yitter/idgen/YitIdHelper.java
@@ -19,7 +19,6 @@ public class YitIdHelper {
         return idGenInstance;
     }
 
-
     /**
      * 设置参数，建议程序初始化时执行一次
      */
@@ -34,9 +33,12 @@ public class YitIdHelper {
      * @return
      */
     public static long nextId() throws IdGeneratorException {
-        //if (idGenInstance == null) {
-        //    idGenInstance = new DefaultIdGenerator(new IdGeneratorOptions((short) 1));
-	 //}
+        // if (idGenInstance == null) {
+        // idGenInstance = new DefaultIdGenerator(new IdGeneratorOptions((short) 1));
+        // }
+
+        if (idGenInstance == null)
+            throw new IdGeneratorException("Please initialize Yitter.IdGeneratorOptions first.");
 
         return idGenInstance.newLong();
     }