From b6be421a1f2e512f22080cb3b86a8f3a7aa61306 Mon Sep 17 00:00:00 2001
From: Matthias Melcher <github@matthiasm.com>
Date: Thu, 23 Nov 2023 15:16:27 +0100
Subject: Added safety when calling Text_Display methods

- before assigning a buffer (Github #845)
- also fixed a warning form unused arg in Fl_Terminal
---
 src/Fl_Text_Display.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/Fl_Text_Display.cxx')

diff --git a/src/Fl_Text_Display.cxx b/src/Fl_Text_Display.cxx
index d1f7bb035..35545614e 100644
--- a/src/Fl_Text_Display.cxx
+++ b/src/Fl_Text_Display.cxx
@@ -1861,7 +1861,7 @@ int Fl_Text_Display::get_absolute_top_line_number() const {
   Does nothing if the absolute top line number is not being maintained.
 */
 void Fl_Text_Display::absolute_top_line_number(int oldFirstChar) {
-  if (maintaining_absolute_top_line_number()) {
+  if (maintaining_absolute_top_line_number() && buffer()) {
     if (mFirstChar < oldFirstChar)
       mAbsTopLineNum -= buffer()->count_lines(mFirstChar, oldFirstChar);
     else
-- 
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