# HG changeset patch
# User rubidium <rubidium@openttd.org>
# Date 2013-11-25 22:32:32
# Node ID 36bbaf5673937ab0eeeda53c539a4ef45e9deb9b
# Parent  f02101b3dda08d2733e496bd6bbb1a162d49a911

(svn r26116) -Codechange: validate that the number of lines in a graph is more than 0

diff --git a/src/graph_gui.cpp b/src/graph_gui.cpp
--- a/src/graph_gui.cpp
+++ b/src/graph_gui.cpp
@@ -200,6 +200,8 @@ protected:
 	 */
 	ValuesInterval GetValuesInterval(int num_hori_lines) const
 	{
+		assert(num_hori_lines > 0);
+
 		ValuesInterval current_interval;
 		current_interval.highest = INT64_MIN;
 		current_interval.lowest  = INT64_MAX;