From f1feaaf4e07e4018c86150141fbed667ff04a49c Mon Sep 17 00:00:00 2001
From: Bart <9132501-flyingsheep@users.noreply.gitlab.com>
Date: Sat, 7 Dec 2024 18:45:20 +0100
Subject: [PATCH] TListView: fix potential AV in SetDropTarget. Issue #19083.

(cherry picked from commit 4204fa7a65f3ba7997b516af1aaea4941005b17c)
---
 lcl/include/customlistview.inc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lcl/include/customlistview.inc b/lcl/include/customlistview.inc
index e952b47d8e..b2cf34e7d3 100644
--- a/lcl/include/customlistview.inc
+++ b/lcl/include/customlistview.inc
@@ -1629,7 +1629,8 @@ end;
 procedure TCustomListView.SetDropTarget(const AValue: TListItem);
 begin
   if not HandleAllocated then Exit;
-  TWSCustomListViewClass(WidgetSetClass).ItemSetState(Self, AValue.Index, AValue, lisDropTarget, True);
+  if AValue <> nil then
+    TWSCustomListViewClass(WidgetSetClass).ItemSetState(Self, AValue.Index, AValue, lisDropTarget, True);
 end;
 
 procedure TCustomListView.SetFocused(const AValue: TListItem);