From 2fb7058ab6a0210d9872802e5a74aa1e77787746 Mon Sep 17 00:00:00 2001
From: Gavin Nishizawa <gavin@terrastruct.com>
Date: Thu, 5 Oct 2023 11:11:25 -0700
Subject: [PATCH] handle nil Keys in Equals

---
 d2ast/d2ast.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/d2ast/d2ast.go b/d2ast/d2ast.go
index 87b0921f6..201d8eb3f 100644
--- a/d2ast/d2ast.go
+++ b/d2ast/d2ast.go
@@ -724,6 +724,12 @@ func (mk1 *Key) D2OracleEquals(mk2 *Key) bool {
 }
 
 func (mk1 *Key) Equals(mk2 *Key) bool {
+	if mk1 == nil && mk2 == nil {
+		return true
+	}
+	if (mk1 == nil) || (mk2 == nil) {
+		return false
+	}
 	if mk1.Ampersand != mk2.Ampersand {
 		return false
 	}