error 500 for wiki creation

[waynehuang13]

• Gitea version (or commit ref): 31aa00f
• Git version: NA
• Operating system: linux
• Database (use [x]):
  • [x ] PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • [ x] No
  • Not relevant
• Log gist: https://gist.github.com/waynehuang13/2e3a1ed83e76af925486156b7fa334c6

Description

trying to create a wiki page for a repo, but it's throwing error 500.
...

Screenshots

[waynehuang13]

working after upgraded to version: abb364f