From b325a6b4b20e250a6907e520a70a9ab2d772adf9 Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Thu, 8 Nov 2018 17:48:18 +0000
Subject: Add guard against gl_draw(const char*, int) called with null 2nd
 argument.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@13117 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/gl_draw.cxx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/gl_draw.cxx')

diff --git a/src/gl_draw.cxx b/src/gl_draw.cxx
index 6af0deb8e..695c4ee08 100644
--- a/src/gl_draw.cxx
+++ b/src/gl_draw.cxx
@@ -128,8 +128,10 @@ void gl_remove_displaylist_fonts()
  \see  gl_texture_pile_height(int)
   */
 void gl_draw(const char* str, int n) {
-  if (has_texture_rectangle)  Fl_Gl_Window_Driver::draw_string_with_texture(str, n);
-  else Fl_Gl_Window_Driver::global()->draw_string_legacy(str, n);
+  if (n > 0) {
+    if (has_texture_rectangle)  Fl_Gl_Window_Driver::draw_string_with_texture(str, n);
+    else Fl_Gl_Window_Driver::global()->draw_string_legacy(str, n);
+  }
 }
 
 
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