diff --git a/browser/main/SideNav/index.js b/browser/main/SideNav/index.js
index fc665052..6a978979 100644
--- a/browser/main/SideNav/index.js
+++ b/browser/main/SideNav/index.js
@@ -440,7 +440,7 @@ class SideNav extends React.Component {
 
     const style = {}
     if (!isFolded) style.width = this.props.width
-    const isTagActive = location.pathname.match(/tag/)
+    const isTagActive = !!location.pathname.match(/tag/)
     return (
       <div className='SideNav'
         styleName={isFolded ? 'root--folded' : 'root'}