NoMethodError: undefined method `commit' for nil:NilClass
https://sentry.gitlab.net/gitlab/gitlabcom/issues/4119804/?referrer=gitlab_plugin
NoMethodError: undefined method `commit' for nil:NilClass
lib/gitlab/ci/config/external/file/project.rb:106:in `block (2 levels) in sha'
loader.call([project, ref_name], project.commit(ref_name).try(:sha))
lib/gitlab/ci/config/external/file/project.rb:105:in `each'
project_ref_pairs.uniq.each do |project, ref_name|
lib/gitlab/ci/config/external/file/project.rb:105:in `block in sha'
project_ref_pairs.uniq.each do |project, ref_name|
lib/gitlab/ci/config/external/file/project.rb:55:in `validate_context!'
elsif sha.nil?
lib/gitlab/ci/config/external/mapper/verifier.rb:36:in `block in process_without_instrumentation'
file.validate_context! if file.valid?
...
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