NoMethodError in EnrollmentsController#enroll_with_subscription

undefined method `id' for nil:NilClass

Extracted source (around line #12):
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enrollment = Enrollment.new
enrollment.course_id = course.id
enrollment.user_id = user.id
enrollment.expiration = Time.now + 365.days
enrollment.subscription = true
enrollment.save!

Rails.root: /var/www/nuvola_academy

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"course_id"=>"1406"}

Response

Headers:

None