From 7cecb81e193f625ce698806ba36eaee4118240c3 Mon Sep 17 00:00:00 2001
From: Julian Eisel <julian@blender.org>
Date: Tue, 22 Mar 2022 18:35:28 +0100
Subject: Fix T96705: Crash when pressing F3 outside a Blender window if
 Developer extras

If the mouse is not hovering the window, there is no active region. This is a
valid state, but the UI-list filter operator didn't account for that case.
---
 source/blender/editors/interface/interface_ops.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/source/blender/editors/interface/interface_ops.c b/source/blender/editors/interface/interface_ops.c
index ed512f510e7..947aa1f477e 100644
--- a/source/blender/editors/interface/interface_ops.c
+++ b/source/blender/editors/interface/interface_ops.c
@@ -1989,6 +1989,9 @@ static void UI_OT_drop_name(wmOperatorType *ot)
 static bool ui_list_focused_poll(bContext *C)
 {
   const ARegion *region = CTX_wm_region(C);
+  if (!region) {
+    return false;
+  }
   const wmWindow *win = CTX_wm_window(C);
   const uiList *list = UI_list_find_mouse_over(region, win->eventstate);
 
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