From 0c2b5d0d79e11c081e180f05b2bf6538d098e7e9 Mon Sep 17 00:00:00 2001
From: Sidharth Vinod <sidharthv96@gmail.com>
Date: Sun, 18 Jun 2023 13:13:40 +0530
Subject: [PATCH] Revert change to if

---
 packages/mermaid/src/diagrams/flowchart/flowDb.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/mermaid/src/diagrams/flowchart/flowDb.js b/packages/mermaid/src/diagrams/flowchart/flowDb.js
index d17abc3f1..ceb933e85 100644
--- a/packages/mermaid/src/diagrams/flowchart/flowDb.js
+++ b/packages/mermaid/src/diagrams/flowchart/flowDb.js
@@ -214,7 +214,7 @@ export const addClass = function (ids, style) {
       classes[id] = { id, styles: [], textStyles: [] };
     }
 
-    if (style) {
+    if (style !== undefined && style !== null) {
       style.forEach(function (s) {
         if (s.match('color')) {
           const newStyle = s.replace('fill', 'bgFill').replace('color', 'fill');