error migrate 1.14.7 to 1.15.11

[tipsang]

Description

I want to migrate from version 1.14.7 to 1.15.11.
The platform is well accessed but when accessing any repository I get a 500 error.
The log shows this:
Render Failed: template: repo/branch_dropdown:12:126: executing "repo/branch_dropdown" at <.root.CommitId>: invalid value; expected string
Template: status/500
What can happen?

Gitea Version

1.15.11

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

No response

Git Version

1.15.11

Operating System

windows Server

How are you running Gitea?

Windows server + SQL Server

Database

MSSQL

[wxiaoguang]

The latest supported release is 1.17.x, please try to upgrade to 1.17.2

[tipsang]

The latest supported release is 1.17.x, please try to upgrade to 1.17.2

Error with 1.17.2
2022/10/05 16:19:51 cmd/web.go:95:func1() [F] PANIC: template: repo/home:67: function "EscapePound" not defined
/usr/local/go/src/html/template/template.go:374 (0x240fab5)
/go/pkg/mod/github.com/unrolled/render@v1.4.1/render.go:322 (0x240f836)
/go/pkg/mod/github.com/unrolled/render@v1.4.1/render.go:202 (0x240ebee)
/go/pkg/mod/github.com/unrolled/render@v1.4.1/render.go:146 (0x240e7c1)
/source/modules/templates/base.go:86 (0x24bf73e)
/source/routers/web/base.go:127 (0x2fbbe69)
/source/routers/web/web.go:123 (0x2fbefab)
/source/routers/init.go:174 (0x2fdeedc)
/source/cmd/web.go:177 (0x30abc66)
/go/pkg/mod/github.com/urfave/cli@v1.22.9/app.go:524 (0x29ef75f)
/go/pkg/mod/github.com/urfave/cli@v1.22.9/command.go:173 (0x29f036b)
/go/pkg/mod/github.com/urfave/cli@v1.22.9/app.go:277 (0x29ed333)
/source/main.go:116 (0x30e2766)
/usr/local/go/src/runtime/proc.go:250 (0x132fc00)
/usr/local/go/src/runtime/asm_386.s:1326 (0x135ce70)

[techknowlogick]

Are you using custom templates?

[tipsang]

Are you using custom templates?

I don't think so. How can I be sure?

[wxiaoguang]

You must be using customized templates. https://docs.gitea.io/en-us/customizing-gitea/#customizing-gitea-pages-and-resources

Remove your customized templates then Gitea will work well.

[wxiaoguang]

Since it doesn't seem to be a Gitea bug, I will close this issue.

Feel free to re-open if you can reproduce it with a fresh setup and confirm it's a bug, or if you would propose some solutions for the edge cases or update the documents to help to future users to get rid of similar problems.