Exception when reporting status in the buildbot UI

[MagicRB]

2024-12-29T14:31:42+0100 [-] Unhandled Error
	Traceback (most recent call last):
	  File "/nix/store/3ix3c6m62qjj6abfxlkxz6nxp6dp1nnk-python3-3.12.7-env/lib/python3.12/site-packages/twisted/internet/defer.py", line 1960, in _gotResultInlineCallbacks
	    _inlineCallbacks(r, gen, status, context)
	  File "/nix/store/3ix3c6m62qjj6abfxlkxz6nxp6dp1nnk-python3-3.12.7-env/lib/python3.12/site-packages/twisted/internet/defer.py", line 2010, in _inlineCallbacks
	    result = context.run(
	  File "/nix/store/3ix3c6m62qjj6abfxlkxz6nxp6dp1nnk-python3-3.12.7-env/lib/python3.12/site-packages/twisted/python/failure.py", line 549, in throwExceptionIntoGenerator
	    return g.throw(self.value.with_traceback(self.tb))
	  File "/nix/store/3ix3c6m62qjj6abfxlkxz6nxp6dp1nnk-python3-3.12.7-env/lib/python3.12/site-packages/buildbot/process/build.py", line 629, in _start_next_step_impl
	    log.err(e)
	--- <exception caught here> ---
	  File "/nix/store/3ix3c6m62qjj6abfxlkxz6nxp6dp1nnk-python3-3.12.7-env/lib/python3.12/site-packages/buildbot/process/build.py", line 622, in _start_next_step_impl
	    terminate = yield self.stepDone(results, step)  # interpret/merge results
	builtins.AssertionError: got None

I got this weird error when testing my internal buildbot instance, it shows up in the UI as so:

Which is weird since the Exception code isnt coming from any of the steps or sub-builds