diff --git a/index.html b/index.html
index d91c1a5..f76ff6f 100644
--- a/index.html
+++ b/index.html
@@ -241,7 +241,7 @@ function RT(){
       };
       dv.appendChild(rw)
     }
-    function onPath(t) { if(!t||t===n)return true; var p=t._p; while(p){if(p===n)return true;p=p._p}return false; }
+    function onPath(t) { if(!t)return false; if(t===n)return true; var p=t._p; while(p){if(p===n)return true;p=p._p}return false; }
     if(br){var kd=document.createElement('div');kd.className='chd'+(onPath(N)?' o':'');
       for(var i=0;i<n.children.length;i++){n.children[i]._p=n;RN(kd,n.children[i],d+1)}
       dv.appendChild(kd)