Project mirror isn't workin

[somera]

• Gitea version (or commit ref): 1.12.1
• Git version: 2.20.1
• Operating system: Linux
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist:

==> log/gitea.log <==
2020/07/05 14:20:57 ...cache/last_commit.go:62:Put() [T] LastCommitCache save: [74748f9f56ba2b5ab942c388f105d5f7b568a25f:Copyright - Woher kommen unsere Listen.md:78c0ca382aef5b4b2037178d3a44ee72afc9814f]
2020/07/05 14:20:57 routers/repo/view.go:138:renderDirectory() [E] GetCommitsInfo: malformed: key is too long or contains invalid characters
/go/src/code.gitea.io/gitea/routers/repo/view.go:138 (0x134cc04)
/go/src/code.gitea.io/gitea/routers/repo/view.go:677 (0x1350c03)
/go/src/code.gitea.io/gitea/routers/repo/view.go:595 (0x13501db)
/usr/local/go/src/reflect/value.go:460 (0xa3333)
/usr/local/go/src/reflect/value.go:321 (0xa2b13)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:177 (0x72df37)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:137 (0x72da23)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:121 (0x744817)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:112 (0xca9e13)
/go/src/code.gitea.io/gitea/modules/context/repo.go:797 (0xca9df8)
/usr/local/go/src/reflect/value.go:460 (0xa3333)
/usr/local/go/src/reflect/value.go:321 (0xa2b13)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:177 (0x72df37)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:137 (0x72da23)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:121 (0x744817)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:112 (0xca88a7)
/go/src/code.gitea.io/gitea/modules/context/repo.go:579 (0xca888c)
/usr/local/go/src/reflect/value.go:460 (0xa3333)
/usr/local/go/src/reflect/value.go:321 (0xa2b13)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:177 (0x72df37)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:137 (0x72da23)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:121 (0x744817)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:112 (0xca66fb)
/go/src/code.gitea.io/gitea/modules/context/panic.go:39 (0xca66e4)
/usr/local/go/src/reflect/value.go:460 (0xa3333)
/usr/local/go/src/reflect/value.go:321 (0xa2b13)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:177 (0x72df37)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:137 (0x72da23)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:121 (0x744817)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:112 (0xc67e93)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/session/session.go:192 (0xc67e78)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:79 (0x7446db)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:157 (0x72dcd3)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:135 (0x72dad3)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:121 (0x744817)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:112 (0x752d2f)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/recovery.go:161 (0x752d18)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/logger.go:40 (0x747a07)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:157 (0x72dcd3)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:135 (0x72dad3)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:121 (0x744817)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:112 (0x7522cf)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/logger.go:52 (0x7522b4)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/logger.go:40 (0x747a07)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:157 (0x72dcd3)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/inject/inject.go:135 (0x72dad3)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/context.go:121 (0x744817)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/router.go:187 (0x753d1b)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/router.go:303 (0x74e743)
/go/src/code.gitea.io/gitea/vendor/gitea.com/macaron/macaron/macaron.go:218 (0x748bc7)
/go/src/code.gitea.io/gitea/vendor/github.com/gorilla/context/context.go:141 (0x988e9f)
/usr/local/go/src/net/http/server.go:2012 (0x2f3953)
/usr/local/go/src/net/http/server.go:2807 (0x2f6297)
/usr/local/go/src/net/http/server.go:1895 (0x2f285f)
/usr/local/go/src/runtime/asm_arm.s:857 (0x7895b)

## Description

Mirror this https://github.com/RPiList/specials.git projects thows an exception.