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-rw-r--r--app/models/merge_request.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index d7e7ae7a25f..9be00880438 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -293,6 +293,8 @@ class MergeRequest < ActiveRecord::Base
attr_writer :target_branch_sha, :source_branch_sha
def source_branch_head
+ return unless source_project
+
source_branch_ref = @source_branch_sha || source_branch
source_project.repository.commit(source_branch_ref) if source_branch_ref
end