From 9da44c1c9b6d3ac9dd3f34369e2864820445b46f Mon Sep 17 00:00:00 2001
From: Juha <juha@lazarus-ide.org>
Date: Tue, 29 Mar 2022 19:54:01 +0300
Subject: [PATCH] Codetools: Do not crash when invoking ident completion on
 empty editor. Issue #39685.

---
 components/codetools/identcompletiontool.pas | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/codetools/identcompletiontool.pas b/components/codetools/identcompletiontool.pas
index 9dd3b438eb..70901cb34a 100644
--- a/components/codetools/identcompletiontool.pas
+++ b/components/codetools/identcompletiontool.pas
@@ -2163,7 +2163,7 @@ begin
                           [btSetIgnoreErrorPos]);
   // Return if CleanCursorPos is before Tree.Root.StartNode.
   // For example a comment at the beginning of a unit.
-  if Tree.Root.StartPos>CleanCursorPos then
+  if (Tree.Root=nil) or (Tree.Root.StartPos>CleanCursorPos) then
     Exit;
   if FindDeepestNodeAtPos(CleanCursorPos,false)=nil then
   begin