From 364c258abaff56389007a2b1e5a83211edd4ff08 Mon Sep 17 00:00:00 2001
From: Mojtaba Samimi <arch.mojtaba.samimi@gmail.com>
Date: Fri, 15 Jul 2022 13:25:45 -0400
Subject: [PATCH] fix 6266 - handle undefined _bgRect in sankey

---
 src/traces/sankey/base_plot.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/traces/sankey/base_plot.js b/src/traces/sankey/base_plot.js
index 65dc467cb85..952b376adb2 100644
--- a/src/traces/sankey/base_plot.js
+++ b/src/traces/sankey/base_plot.js
@@ -48,6 +48,7 @@ function subplotUpdateFx(gd, index) {
     var dragMode = fullLayout.dragmode;
     var cursor = fullLayout.dragmode === 'pan' ? 'move' : 'crosshair';
     var bgRect = trace._bgRect;
+    if(!bgRect) return;
 
     if(dragMode === 'pan' || dragMode === 'zoom') return;