Commit Graph not working

[alpe12]

Description

All my commit graph pages load with a 500 image and this error:

An error occurred:

Render failed, failed to render template: repo/graph, error: template error: builtin(bindata):repo/graph:41:67 : executing "repo/graph" at <.ShortName>: can't evaluate field ShortName in type *git.Reference
----------------------------------------------------------------------
											{{svg "octicon-git-branch" 16 "gt-mr-2"}}<span title="{{.ShortName}}">{{.ShortName}}</span>
											                                                        ^
----------------------------------------------------------------------

Every page with commits on try.gitea.io returns 500 as well, but without an error shown. eg: https://try.gitea.io/silverwind/symlink-test/graph

Gitea Version

1.20.0+dev-955-g51b130831

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

No response

Git Version

2.40.1

Operating System

Ubuntu

How are you running Gitea?

Docker

version: '3.3'
services:
  gitea:
    image: gitea/gitea:nightly-rootless
    container_name: gitea
    ports:
      - 192.168.1.250:2222:22
      - 127.0.0.1:8139:3000
    volumes:
      - './data:/data'
    environment:
      - TZ=America/Sao_Paulo
      
      #for rootless
      - GITEA_APP_INI=/data/gitea/conf/app.ini
      - GITEA_TEMP=/data/gitea/tmp
      - TMPDIR=/data/gitea/tmp
      - GITEA_CUSTOM=/data/gitea
      - GITEA_WORK_DIR=/app/gitea/gitea
      - GITEA__server__START_SSH_SERVER=true
      
      - GITEA__service__DISABLE_REGISTRATION=true
      - GITEA__server__ROOT_URL=https://192.168.1.250:48139/
      - GITEA__server__SSH_PORT=2222
      - GITEA__server__ENABLE_GZIP=true
      - GITEA__server__LANDING_PAGE=home
      
      - GITEA__git__MAX_GIT_DIFF_LINES=5000
      - GITEA__git__MAX_GIT_DIFF_LINE_CHARACTERS=10000
      
      - GITEA__i18n__LANGS=en-US,es-ES,pt-BR
      - GITEA__i18n__NAMES=English,español,português do Brasil
      
      - GITEA__security__DISABLE_GIT_HOOKS=true
      - GITEA__security__REVERSE_PROXY_TRUSTED_PROXIES=127.0.0.1/8,172.17.0.0/12
      
      - GITEA__other__SHOW_FOOTER_VERSION=false
      - GITEA__other__SHOW_FOOTER_TEMPLATE_LOAD_TIME=false
      
      - GITEA__log__DISABLE_ROUTER_LOG=true
      - GITEA__log__ROUTER=none
      
      - GITEA__session__COOKIE_SECURE=true
      - GITEA__session__SAME_SITE=strict
      
      - GITEA__ui__DEFAULT_THEME=github-auto
      - GITEA__ui__THEMES=auto,gitea,arc-green,github,github-dark,github-auto
    restart: unless-stopped
    mem_limit: 300M
    cpu_shares: 256
    pids_limit: 100
    security_opt:
      - no-new-privileges=true

Database

SQLite