54 bytes, text/plain
Go to a make such as https://superhypeassemble.makes.org/thimble/MTk5Njk0NzcxMg==/assembles-space-maker-party , click details on the top, attempt to like it. It does a POST request with 'makeID=id' and thus fails because the id provided isn't an actual id
https://github.com/mozilla/webmaker.org/blob/master/views/details.html#L86 Looks like it might be the same problem with reporting as well.
Commit pushed to master at https://github.com/mozilla/webmaker.org https://github.com/mozilla/webmaker.org/commit/c6b8bcbb58c027553ea2d734ca6b0befb63e2c9c Merge pull request #917 from errietta/bug1047089 1047089 fix id