NoMethodError in FrontendController#print_courseplan

undefined method `name' for nil:NilClass

Extracted source (around line #29):
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if params[:room] && !params[:category]
room = current_site.course_rooms.find_by(id: params[:room])
title = t('views.frontend.courses.courseplan') + ': ' + room.name
course_categories = current_site.course_categories.includes(:courses).actives.order('name asc')
courses = room.courses.actives.order('start asc')

Rails.root: /var/www/clients/client1/web1/web/www

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"room"=>"_gup05e7246ekb1e4k4c21k8dcek72b89cd02165"}

Response

Headers:

None