From e6093782644b83c3c5112b1facf0a680c4005817 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Wed, 8 May 2024 13:52:32 +0200
Subject: Avoid possible dereferencing of null pointer (#971)

---
 src/Fl_Tree.cxx | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/Fl_Tree.cxx')

diff --git a/src/Fl_Tree.cxx b/src/Fl_Tree.cxx
index a545a321c..50f13b988 100644
--- a/src/Fl_Tree.cxx
+++ b/src/Fl_Tree.cxx
@@ -383,6 +383,7 @@ int Fl_Tree::handle(int e) {
     case FL_PUSH: {             // clicked on tree
       last_my = Fl::event_y();  // save for dragging direction..
       if (Fl::visible_focus() && handle(FL_FOCUS)) Fl::focus(this);
+      if ( ! _root ) return(ret); // issue #971
       Fl_Tree_Item *item = _root->find_clicked(_prefs, 0);
       // Tell FL_DRAG what was pushed
       _lastpushed = item ? item->event_on_collapse_icon(_prefs) ? PUSHED_OPEN_CLOSE  // open/close icon clicked
-- 
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