From 928f19c879b4f06600750f29b146eb24ca38a620 Mon Sep 17 00:00:00 2001
From: dominik-zeglen <flesz3@o2.pl>
Date: Wed, 6 Nov 2019 16:51:02 +0100
Subject: [PATCH] Remove listener only if it exists

---
 src/hooks/useElementScroll.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/hooks/useElementScroll.ts b/src/hooks/useElementScroll.ts
index 925a8bba4..fa4156ced 100644
--- a/src/hooks/useElementScroll.ts
+++ b/src/hooks/useElementScroll.ts
@@ -35,7 +35,11 @@ function useElementScroll(anchor: MutableRefObject<HTMLElement>): Position {
       );
       anchor.current.addEventListener("scroll", handleScroll);
 
-      return () => anchor.current.removeEventListener("scroll", handleScroll);
+      return () => {
+        if (!!anchor.current) {
+          anchor.current.removeEventListener("scroll", handleScroll);
+        }
+      };
     }
   }, [anchor.current]);