From dbf232acb059f9f3f8972242b68a9384b1290dd4 Mon Sep 17 00:00:00 2001
From: Hayleigh Thompson <me@hayleigh.dev>
Date: Sat, 14 Oct 2023 12:39:51 +0100
Subject: :bug: Fixed bug where morphing existing DOM nodes could cause crashes
 with events.

---
 src/runtime.ffi.mjs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/runtime.ffi.mjs b/src/runtime.ffi.mjs
index bbc76b4..28516ac 100644
--- a/src/runtime.ffi.mjs
+++ b/src/runtime.ffi.mjs
@@ -90,6 +90,10 @@ function morphElement(prev, curr, ns, dispatch, parent) {
   const prevAttrs = prev.attributes;
   const currAttrs = new Map();
 
+  // This can happen if we're morphing an existing DOM element that *wasn't*
+  // initially created by lustre.
+  prev.$lustre ??= {};
+
   let currAttr = curr[1];
   while (currAttr.head) {
     if (currAttr.head[0] === "class" && currAttrs.has("class")) {
-- 
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