From 97946eb5235f4de966b72108c7162e3a39ffcb61 Mon Sep 17 00:00:00 2001
From: John <11955347+JohnSongSoftware@users.noreply.github.com>
Date: Thu, 30 Sep 2021 23:10:53 -0400
Subject: [PATCH] checking func is null interaction process

---
 src/LayersTreeSearch.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/LayersTreeSearch.ts b/src/LayersTreeSearch.ts
index 2c5646b..afcdc73 100644
--- a/src/LayersTreeSearch.ts
+++ b/src/LayersTreeSearch.ts
@@ -178,7 +178,10 @@ export class LayersTreeSearch
 
         for (let i = 0, l = q.length; i < l; i++)
         {
-            func(event, q[i], false);
+            if (func)
+            {
+                func(event, q[i], false);
+            }
         }
         q = queue[1];
         for (let i = 0, l = q.length; i < l; i++)