From 5a78b7736881da8d4970dca1673de16c55bff938 Mon Sep 17 00:00:00 2001
From: Andre Henn <henn@terrestris.de>
Date: Mon, 11 Mar 2024 10:56:02 +0100
Subject: [PATCH] fix: adds null check

---
 src/Button/MeasureButton/MeasureButton.tsx | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Button/MeasureButton/MeasureButton.tsx b/src/Button/MeasureButton/MeasureButton.tsx
index 6f19c3b65..436da652c 100644
--- a/src/Button/MeasureButton/MeasureButton.tsx
+++ b/src/Button/MeasureButton/MeasureButton.tsx
@@ -517,8 +517,12 @@ export const MeasureButton: FC<MeasureButtonProps> = ({
     const onMapClickKey = map?.on('click', onMapClick);
 
     return () => {
-      unByKey(onDrawStartKey);
-      unByKey(onDrawEndKey);
+      if (!_isNil(onDrawStartKey)) {
+        unByKey(onDrawStartKey);
+      }
+      if (!_isNil(onDrawEndKey)) {
+        unByKey(onDrawEndKey);
+      }
       if (onMapPointerMoveKey) {
         unByKey(onMapPointerMoveKey);
       }