diff --git a/util/index.js b/util/index.js
index 4ecd4ec..06aade5 100644
--- a/util/index.js
+++ b/util/index.js
@@ -1,5 +1,6 @@
 module.exports = {
   toBoolean(val) {
+    if (typeof val === 'boolean') return val
     if (val === '') return val
     return val === 'true' || val == '1'
   },