Warnings while updating/creating the port's index

[Lefteris Tsintjelis]

I am curently using portsdb -U to make the index. Are these errors
safe to ignore or is it better to update the index some other way?

Updating the ports index ... Generating INDEX.tmp - please wait..Warning: Duplicate INDEX entry: mod_frontpage2-5.0.2.2635
Warning: Duplicate INDEX entry: mod_jk2-apache2-2.0.2
Warning: Duplicate INDEX entry: mod_rpaf-ap2-0.5
 Done.