From ccdbc28ed80d0df00c599c7b387c34a14a5ac23b Mon Sep 17 00:00:00 2001
From: biwa <6475593+biwa@users.noreply.github.com>
Date: Sat, 7 May 2022 18:49:36 +0200
Subject: [PATCH] Visual Mode: fixed an issue where deleting a thing could
 cause a crash. Fixes #730

---
 Source/Plugins/BuilderModes/VisualModes/BaseVisualMode.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Source/Plugins/BuilderModes/VisualModes/BaseVisualMode.cs b/Source/Plugins/BuilderModes/VisualModes/BaseVisualMode.cs
index 60e2c152..82528886 100755
--- a/Source/Plugins/BuilderModes/VisualModes/BaseVisualMode.cs
+++ b/Source/Plugins/BuilderModes/VisualModes/BaseVisualMode.cs
@@ -3850,8 +3850,11 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			List<IVisualEventReceiver> objs = GetSelectedObjects(true, true, true, true, false);
             foreach (IVisualEventReceiver i in objs)
             {
-                if (i is BaseVisualThing)
-                    visiblethings.Remove((BaseVisualThing)i); // [ZZ] if any
+				if (i is BaseVisualThing)
+				{
+					visiblethings.Remove((BaseVisualThing)i); // [ZZ] if any
+					allthings.Remove(((BaseVisualThing)i).Thing);
+				}
                 i.OnDelete();
             }
             PostAction();