-if (param('show') eq 'all'){
- $showticks = '';
-}elsif (param('show') =~ /^(\d+)$/){
- $showticks = "AND (i.tick - i.eta) > (tick() - $1)";
+if (defined param('show')){
+ if (param('show') eq 'all'){
+ $showticks = '';
+ }elsif (param('show') =~ /^(\d+)$/){
+ $showticks = "AND (i.tick - i.eta) > (tick() - $1)";
+ }