From a7310cf59b0b93c61ab89024e46cda855a2b673c Mon Sep 17 00:00:00 2001
From: "Eevee (Evelyn Woods)" <eevee.git@veekun.com>
Date: Tue, 5 Jan 2021 22:38:05 -0700
Subject: [PATCH] Fix bad editor state caused by copying a selection

---
 js/main-editor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/main-editor.js b/js/main-editor.js
index 446289c..58c5f68 100644
--- a/js/main-editor.js
+++ b/js/main-editor.js
@@ -2335,7 +2335,7 @@ class Selection {
         for (let [x, y] of this.iter_cells()) {
             let n = stored_level.coords_to_scalar(x, y);
             if (copy) {
-                this.floated_cells.push(stored_level.linear_cells[n].map(tile => ({...tile})));
+                this.floated_cells.push(stored_level.linear_cells[n].map(tile => tile ? {...tile} : null));
             }
             else {
                 this.floated_cells.push(stored_level.linear_cells[n]);