Wrong type argument: stringp, nil

[kulbida]

While trying to find other file getting with M-x helm-projectile-find-other-file getting this:
Wrong type argument: stringp, nil

Debugger output:

1 Debugger entered--Lisp error: (wrong-type-argument stringp nil)
2   file-name-nondirectory(nil)
3   projectile-associated-file-name-extensions(nil)
4   projectile-get-other-files(nil (".gitattributes" ".gitignore" "Capfile" "DEPLOY_NOTES.md" "DEVELOPMENT_TARGET_VERSION.rb" "Gemfile" "Gemfile.lock" "Procfile" "README.md" "Rakefile" "app$
5   helm-projectile-find-other file(nil)
6   call-interactively(helm-projectile-find-other-file nil nil)
7   command-execute(helm-projectile-find-other-file) 

[bbatsov]

Seems like a duplicate of bbatsov/helm-projectile#10