diff --git a/db.js b/db.js
index 1ed58c7..c239e6c 100644
--- a/db.js
+++ b/db.js
@@ -54,7 +54,7 @@ const db = function ({host, port, user, password, database}) {
               sqlcode1+=` AUTO_INCREMENT PRIMARY KEY`;
               sqlcode2+=` AUTO_INCREMENT PRIMARY KEY`;
               sqlcode3+=` AUTO_INCREMENT`;
-            }else if(!!attribute.default){
+            }else if(attribute.default != null){
               sqlcode1+=` DEFAULT ${con.escape(attribute.default)}`;
               sqlcode2+=` DEFAULT ${con.escape(attribute.default)}`;
               sqlcode3+=` DEFAULT ${con.escape(attribute.default)}`;