Libusb exeption in ft232h serial

after executing lightpipe.py with serial = ft232h there is an error

➜  driver git:(feature-hardware-support-for-ft232h) /bin/python /home/mario/Schreibtisch/ccc/lightpipe/driver/lightpipe.py
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python: ../../libusb/os/threads_posix.h:46: usbi_mutex_lock: Assertion `pthread_mutex_lock(mutex) == 0' failed.
[1]    80343 IOT instruction (core dumped)  /bin/python /home/mario/Schreibtisch/ccc/lightpipe/driver/lightpipe.py