From 063eabed7108c1fa8d7e69b3553b4da79647d5e8 Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@matrix.org>
Date: Tue, 6 Aug 2019 16:32:01 +0200
Subject: [PATCH] don't return invalid indices from model, fix for #10358

---
 src/editor/model.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/editor/model.js b/src/editor/model.js
index 74546b9bf8..759e13aabb 100644
--- a/src/editor/model.js
+++ b/src/editor/model.js
@@ -80,7 +80,8 @@ export default class EditorModel {
             const part = this._parts[index];
             return new DocumentPosition(index, part.text.length);
         } else {
-            return new DocumentPosition(0, 0);
+            // part index -1, as there are no parts to point at
+            return new DocumentPosition(-1, 0);
         }
     }