From 5460bc0a0c46dcd6dda345357d7ac418c9c20a74 Mon Sep 17 00:00:00 2001
From: Austin Fulbright <austinfulbright@Austins-Laptop.local>
Date: Wed, 24 Jul 2024 07:13:10 -0400
Subject: [PATCH] fixed checkout branch with no commits

---
 packages/mermaid/src/diagrams/git/gitGraphAst.ts | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/packages/mermaid/src/diagrams/git/gitGraphAst.ts b/packages/mermaid/src/diagrams/git/gitGraphAst.ts
index b04e78d8c5..9a26d32f7d 100644
--- a/packages/mermaid/src/diagrams/git/gitGraphAst.ts
+++ b/packages/mermaid/src/diagrams/git/gitGraphAst.ts
@@ -399,14 +399,11 @@ export const checkout = function (branch: string) {
   } else {
     curBranch = branch;
     const id = branches.get(curBranch);
-
-    if (id === null || id === undefined) {
-      throw new Error('Branch ' + branch + ' has no commits');
-    }
-    if (commits.get(id) === undefined) {
-      throw new Error('Branch ' + branch + ' has no commits');
+    if (id === undefined || !id) {
+      head = null;
+    } else {
+      head = commits.get(id) ?? null;
     }
-    head = commits.get(id) ?? null;
   }
 };