Error when creating a new merge request against branch off master

I have created a local branch off of my master branch, made some changes to the code, committed, pushed and created a merge request against master. This works fine. When I go to edit the merge request and change the target branch to a new branch created off master I get a 503. The new branch and the local branch were created from the same version of master. I'm trying to figure out if this is a gitlab issue or an issue I am having with this repository.

Here is the gitlab log error GRPC::Unavailable (14:CommitDiff: exit status 128):    lib/gitlab/gitaly_client/diff_stitcher.rb:15:in each'    lib/gitlab/gitaly_client/diff_stitcher.rb:15:in each'    lib/gitlab/git/diff_collection.rb:109:in each_gitaly_patch'    lib/gitlab/git/diff_collection.rb:49:in each'    lib/gitlab/git/diff_collection.rb:98:in populate!'    lib/gitlab/git/diff_collection.rb:75:in real_size'    app/models/merge_request_diff.rb:521:in save_diffs'    app/models/merge_request_diff.rb:156:in save_git_content'    app/models/merge_request.rb:699:in block in create_merge_request_diff'    lib/gitlab/gitaly_client.rb:299:in allow_n_plus_1_calls'    app/models/merge_request.rb:698:in create_merge_request_diff'    app/services/merge_requests/reload_diffs_service.rb:12:in execute'    app/models/merge_request.rb:754:in reload_diff'    app/models/merge_request.rb:746:in reload_diff_if_branch_changed'    app/services/issuable_base_service.rb:214:in block in update'    app/services/issuable_base_service.rb:214:in update'    app/services/merge_requests/update_service.rb:24:in execute'    app/controllers/projects/merge_requests_controller.rb:109:in update'    lib/gitlab/i18n.rb:55:in with_locale'    lib/gitlab/i18n.rb:61:in with_user_locale'    app/controllers/application_controller.rb:434:in set_locale'    lib/gitlab/middleware/multipart.rb:103:in call'    lib/gitlab/request_profiler/middleware.rb:16:in call'    lib/gitlab/middleware/go.rb:20:in call'    lib/gitlab/etag_caching/middleware.rb:13:in call'    lib/gitlab/middleware/correlation_id.rb:16:in block in call'    lib/gitlab/correlation_id.rb:15:in use_id'    lib/gitlab/middleware/correlation_id.rb:15:in call'    lib/gitlab/middleware/read_only/controller.rb:40:in call'    lib/gitlab/middleware/read_only.rb:18:in call'    lib/gitlab/middleware/basic_health_check.rb:25:in call'    lib/gitlab/request_context.rb:26:in call'    lib/gitlab/metrics/requests_rack_middleware.rb:29:in call'    lib/gitlab/middleware/release_env.rb:13:in call' Completed 503 Service Unavailable in 239ms (Views: 0.7ms | ActiveRecord: 49.6ms)