Is it possible to log numpy nan in the logger?

Hello!

I am using np.nan in some variables. However the issue is that apparently the logger doesnt accept Nan.
I have the traceback:

File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libqtopensesame/misc/process.py", line 154, in run
    exp.run()
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/experiment.py", line 449, in run
    self.items.execute(self.var.start)
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 103, in execute
    self.run(name)
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 122, in run
    self[name].run()
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/sequence.py", line 51, in run
    self.experiment.items.run(_item)
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 122, in run
    self[name].run()
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/loop.py", line 341, in run
    self.experiment.items.execute(self._item)
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 103, in execute
    self.run(name)
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 122, in run
    self[name].run()
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/sequence.py", line 51, in run
    self.experiment.items.run(_item)
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 122, in run
    self[name].run()
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/logger.py", line 49, in run
    self._logvars = self.experiment.log.all_vars()
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/openexp/_log/log.py", line 92, in all_vars
    self._all_vars = list(self.experiment.var.inspect().keys())
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/var_store.py", line 418, in inspect
    for var, desc in item.var_info():
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/experiment.py", line 645, in var_info
    l.append( (var, self.var.get(var, _eval=False)) )
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/var_store.py", line 266, in get
    if int(val) == val:
ValueError: cannot convert float NaN to integer

Am I doing something wrong or is it the normal behavior of the logger?

Thanks,

Sylvain