PR commits API returns with internal server error if the base branch is missing

[mecseid]

Description

Wanted to fetch PR commits from /repos/{owner}/{repo}/pulls/{index}/commits, but if the base (target) branch missing, it returns with HTTP 500.

The corresponding log:

2026/01/14 14:48:17 routers/api/v1/repo/pull.go:1469:GetPullRequestCommits() [E] InternalServerError: exit status 128: Stderr: fatal: bad revision 'release-1.3.0...refs/pull/1/head'
2026/01/14 14:48:17 HTTPRequest [I] router: completed GET /api/v1/repos/TestGroup/test-repo/pulls/1/commits?page=1&limit=100&verification=false&files=false for 10.42.3.51:38594, 500 Internal Server Error in 73.3ms @ repo/pull.go:1395(repo.GetPullRequestCommits)

The UI shows the PR related commits as expected.

Gitea Version

1.24.7

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

Running inside Kubernetes as a very basic deployment.
Used image is gitea/gitea:1.24.7-rootless

Database

PostgreSQL