From ceb8796590bcdf01cde2d1f89c03116fee08be6a Mon Sep 17 00:00:00 2001
From: Bartek Fabiszewski <github@fabiszewski.net>
Date: Sun, 22 Dec 2019 14:57:25 +0100
Subject: [PATCH] Fix null reference

---
 js/src/chartviewmodel.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/js/src/chartviewmodel.js b/js/src/chartviewmodel.js
index f84c549..289a40b 100644
--- a/js/src/chartviewmodel.js
+++ b/js/src/chartviewmodel.js
@@ -176,7 +176,9 @@ export default class ChartViewModel extends ViewModel {
    * @param {string} $className
    */
   pointsRemoveClass($className) {
-    this.chartPoints.forEach((el) => el.classList.remove($className));
+    if (this.model.chartVisible && this.chartPoints) {
+      this.chartPoints.forEach((el) => el.classList.remove($className));
+    }
   }
 
   /**