- my $y_space_for_label = $Height * 0.6
- *( 1 - ($args{'element'}-$min_value)/($max_value-$min_value) );
+ my $y_space_for_label;
+ if ($max_value == $min_value) {
+ $y_space_for_label = 0;
+ }
+ else {
+ $y_space_for_label = $Height * 0.6
+ *( 1 - ($args{'element'}-$min_value)/($max_value-$min_value) );
+ }