Thanks for the report & digging out the relevant patch. I uploaded the upstream 2.1.15~rc1 version, which includes this patch and addresses a couple other issues as well.
- Bug#985124: fossil: fails to update schema for older ... Sergei Golovan
- Bug#985124: Acknowledgement (fossil: fails to up... Sergei Golovan
- Bug#985124: Acknowledgement (fossil: fails t... Barak A. Pearlmutter