got this runtime error on heroku, it had been working fine...

I traced it down to this

add_breadcrumb 'category / ' << @title, categories_path

in my category controller (I've commented it out for now). Is there an alternative way to concat this so it doesn't cause an error?

Maybe this gem could help? https://github.com/weppos/breadcrumbs_on_rails

yes, i'm using that gem. Just stopped liking the way I concatenated the breadcrumb.

What should add_breadcrumb 'category / ' << @title, categories_path output?

it should add / category / + category title to my breadcrumb.

How about something like this?

add_breadcrumb "category / #{@title}", categories_path