From c71c1d4d1af6e810899e14e64860ffacfb5021b0 Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Sat, 1 Jun 2019 00:15:09 +0100
Subject: [PATCH] Prevent infinite loop when grid size not defined.

---
 common/gal/opengl/opengl_gal.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/gal/opengl/opengl_gal.cpp b/common/gal/opengl/opengl_gal.cpp
index 0118b9125c..c96200cac5 100644
--- a/common/gal/opengl/opengl_gal.cpp
+++ b/common/gal/opengl/opengl_gal.cpp
@@ -1253,7 +1253,7 @@ void OPENGL_GAL::DrawGrid()
     // force flush
     nonCachedManager->EndDrawing();
 
-    if( !gridVisibility )
+    if( !gridVisibility || gridSize.x == 0 || gridSize.y == 0 )
         return;
 
     VECTOR2D gridScreenSize( gridSize );