--- chart.module	2008-09-11 17:28:15.000000000 -0400
+++ chart.new.module	2010-07-29 10:07:18.000000000 -0400
@@ -396,7 +396,8 @@ function _chart_adjust_resolution($chart
       $divider = round($max[$chart_id] / $resoluton, 1);  
     }
     else {
-      $multiplier = round($resoluton / $max[$chart_id], 1);  
+      $max[$chart_id] = max($max[$chart_id], 1);
+      $multiplier = round($resoluton / $max[$chart_id], 1);   
     }
                  
     foreach($data AS $k => $v){