diff --git a/History.md b/History.md
index 16f5dcc..cac06e2 100644
--- a/History.md
+++ b/History.md
@@ -1,4 +1,4 @@
-# 3.0.2 / 2018-06-21
+# 3.0.3 / 2018-06-21
 * 修复filter解析空条件异常的bug; 
 * table方法支持 AS 别名。
 
diff --git a/lib/utils.js b/lib/utils.js
index 82cd838..0cb7806 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -154,7 +154,7 @@ const parser = {
 
   filter(opt) {
     let sql = ''
-    if (!sql) {
+    if (!opt) {
       return ' '
     }
     if (typeof opt === 'string') {
diff --git a/package.json b/package.json
index b52308b..6bfbae5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mysqli",
-  "version": "3.0.2",
+  "version": "3.0.3",
   "description": "MySQL tool",
   "main": "index.js",
   "dependencies": {