Issue with threads

[jacknicoludis]

I started ipymol using:

from ipymol import viewer as pymol
pymol.start()

However, if I try to re-run the cell, I get the following error:

---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
<ipython-input-108-d61299d94d8a> in <module>
----> 1 pymol.start()

~/anaconda3/lib/python3.7/site-packages/ipymol/core.py in start(self)
39 print("A PyMOL RPC server is already running.")
40 return
---> 41 self._thread.start()
42 self._server = Server(
43 uri="http://%s:%d/RPC2" % (self.host, self.port)

~/anaconda3/lib/python3.7/threading.py in start(self)
841
842 if self._started.is_set():
--> 843 raise RuntimeError("threads can only be started once")
844 with _active_limbo_lock:
845 _limbo[self] = self

RuntimeError: threads can only be started once

How can I end a thread to re-run cells with ipymol commands?