From a4d1d86d7bbe92497575cf01e585e421498b8425 Mon Sep 17 00:00:00 2001
From: Andrew Liu <aliu2@ufl.edu>
Date: Sun, 2 Oct 2022 14:32:50 -0400
Subject: [PATCH] Fixed labelText undefined behavior

---
 packages/mermaid/src/dagre-wrapper/shapes/util.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/mermaid/src/dagre-wrapper/shapes/util.js b/packages/mermaid/src/dagre-wrapper/shapes/util.js
index 1655d2e91..dfd1a93ba 100644
--- a/packages/mermaid/src/dagre-wrapper/shapes/util.js
+++ b/packages/mermaid/src/dagre-wrapper/shapes/util.js
@@ -19,7 +19,13 @@ export const labelHelper = (parent, node, _classes, isNode) => {
   // Create the label and insert it after the rect
   const label = shapeSvg.insert('g').attr('class', 'label').attr('style', node.labelStyle);
 
-  const labelText = typeof node.labelText === 'string' ? node.labelText : node.labelText[0];
+  // Replace labelText with default value if undefined
+  let labelText;
+  if (typeof node.labelText === 'undefined') {
+    labelText = '';
+  } else {
+    labelText = typeof node.labelText === 'string' ? node.labelText : node.labelText[0];
+  }
 
   const text = label
     .node()