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-rw-r--r--lib/gitlab/git/repository.rb6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index d399636bb28..4657e2cc6ae 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -1253,7 +1253,11 @@ module Gitlab
# Gitaly migration: https://gitlab.com/gitlab-org/gitaly/issues/695
def git_merged_branch_names(branch_names = [])
- root_sha = find_branch(root_ref).target
+ return [] unless root_ref
+
+ root_sha = find_branch(root_ref)&.target
+
+ return [] unless root_sha
git_arguments =
%W[branch --merged #{root_sha}