TypeError: nil can't be coerced into Integer
https://sentry.gitlab.net/gitlab/gitlabcom/issues/793871/
TypeError: nil can't be coerced into Integer
project_statistics.rb:57:in `+'
self.storage_size = repository_size + wiki_size + lfs_objects_size + build_artifacts_size + packages_size
project_statistics.rb:57:in `update_storage_size'
self.storage_size = repository_size + wiki_size + lfs_objects_size + build_artifacts_size + packages_size
gitlab/metrics/instrumentation.rb:161:in `block in update_storage_size'
.measure { super }
gitlab/metrics/method_call.rb:36:in `measure'
retval = yield
gitlab/metrics/instrumentation.rb:161:in `update_storage_size'
.measure { super }
...
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TypeError: nil can't be coerced into Integer