Heroku error "Unexpected error while processing request: can't convert nil into String"

Question

I have a Sinatra app that is located here https://github.com/trivektor/Backbone-Hangman. The first time I push it to Heroku, everything worked fine. However, on the second push my application crashed. The only thing that I changed was CSS. Checking the logs, I found the message

Unexpected error while processing request: can't convert nil into String

Does anyone know why this is happening? Thanks.

Can you provide a full stacktrace? Does it give a line number? — mscccc, Jan 15 '12 at 19:51

score 1 · Answer 1 · edited May 23 '17 at 12:21

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Sometime the lack of a closing } can cause this. Check those in all your css files and prescompile assets for production. RAILS_ENV=production bundle exec rake assets:precompileHere is some more details

edited May 23 '17 at 12:21

Community

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answered Jan 16 '12 at 21:35

Yuri

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score 1 · Answer 2 · edited Jan 23 '12 at 23:33

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I was getting the same error in a Sinatra app this week. Looking at the git repo provided by this questions author, I saw this commit. It fixed the issue I was having.

edited Jan 23 '12 at 23:33

Marvin Pinto

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answered Jan 23 '12 at 21:06

Sean Dixon

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score 0 · Answer 3 · answered Jan 06 '13 at 23:24

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I had this issue using sinatra-activerecord. Updating my database and rebooting the environment did the trick for me:

rake db:migrate

answered Jan 06 '13 at 23:24

jchook

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Heroku error "Unexpected error while processing request: can't convert nil into String"

3 Answers3