SystemError: NULL object passed to Py_BuildValue about yappi HOT 3 CLOSED

import yappi
import time


def foo():
    time.sleep(0.1)


n = 0
while (n < 5):
    yappi.start()
    foo()
    yappi.stop()
    yappi.get_func_stats().print_all()

    n += 1

import yappi
import time
import thread


def foo():
    while 1:
        time.sleep(0.1)


n = 0
thread.start_new(foo, ())

while True:
    yappi.start()
    time.sleep(0.15)
    yappi.stop()
    yappi.get_func_stats().print_all()