From 67bb6a8d1cea19ce68528ef10c0853fc67a00aa8 Mon Sep 17 00:00:00 2001
From: Denisoed <denisoed@gmail.com>
Date: Sat, 6 Mar 2021 22:26:55 +0600
Subject: [PATCH] fix condition for toggle tooltip

---
 src/orthography/orthographyTooltip.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/orthography/orthographyTooltip.ts b/src/orthography/orthographyTooltip.ts
index 9b9b95f..1938867 100644
--- a/src/orthography/orthographyTooltip.ts
+++ b/src/orthography/orthographyTooltip.ts
@@ -69,7 +69,7 @@ export class OrthographyTooltip implements IOrthographyTooltip {
 
   private toggleTooltip(event: any): void {
     if (event.type === 'mouseover') {
-      if (event.target.className.includes(HIGHLIGHT_CSS_CLASS)) {
+      if (event.target && event.target.className.includes(HIGHLIGHT_CSS_CLASS)) {
         self.setDataToTooltip(event.target);
         self.tooltip.classList.add(TOOLTIP_VISIBLE_CSS_CLASS);
         self.tooltip.style.left = self.getLeftPos(event);