Interactive Beam example failing from stack overflow

RecursionError: maximum recursion depth exceeded in _instancecheck_

at https://github.com/apache/beam/blob/master/sdks/python/apache_beam/runners/interactive/pipeline_analyzer.py#L405

This occurred after the execution of the last cell in https://github.com/apache/beam/blob/master/sdks/python/apache_beam/runners/interactive/examples/Interactive%20Beam%20Example.ipynb