422 Error on creating build

I’m using pybuildkite client to operate my pipelines.
Trying to invoke builds.create_build() method on one specific pipeline i’ll get requests.exceptions.HTTPError: 422 Client Error: Unprocessable Entity for url: message. On all other pipelines everything works perfectly.
The only difference of this pipeline - it got a long name, but its not supposed to throw this kind of error.
Any suggestions?

Hello, @pkolom and welcome to the Buildkite Community!
Can you share the link to the pipeline where you’re experiencing this issue with us? Please send it to support@buildkite.com.
Many thanks!