float_index_to_time_index: ValueError: Invalid value NaN (not a number)

[lkorczowski]

The following error happens, seemingly randomly (!), when I load a eeg file in script_RASR_comparison() and try to convert the index using the float_index_to_time_index function. Sometimes the script works perfectly fine start to begin and sometimes I got this error.

/Users/louis/anaconda3/envs/timeflux_rasr-env/lib/python3.7/site-packages/pyxdf/pyxdf.py:578: RuntimeWarning: invalid value encountered in greater
  threshold_samples * stream.tdiff))
Warning : Channel description is empty
Traceback (most recent call last):
  File "/Users/louis/anaconda3/envs/timeflux_rasr-env/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3319, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-2-58dd86da87e9>", line 1, in <module>
    runfile('/Volumes/Ext/git/timeflux_rasr/notebooks/script_RASR_comparison.py', wdir='/Volumes/Ext/git/timeflux_rasr/notebooks')
  File "/Applications/PyCharm CE with Anaconda plugin.app/Contents/plugins/python-ce/helpers/pydev/_pydev_bundle/pydev_umd.py", line 197, in runfile
    pydev_imports.execfile(filename, global_vars, local_vars)  # execute the script
  File "/Applications/PyCharm CE with Anaconda plugin.app/Contents/plugins/python-ce/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "/Volumes/Ext/git/timeflux_rasr/notebooks/script_RASR_comparison.py", line 61, in <module>
    df_eeg_raw = float_index_to_time_index(df_eeg_raw)
  File "/Volumes/Ext/git/timeflux_rasr/utils/utils.py", line 202, in float_index_to_time_index
    df.index = df.index.map(datetime.utcfromtimestamp)
  File "/Users/louis/anaconda3/envs/timeflux_rasr-env/lib/python3.7/site-packages/pandas/core/indexes/base.py", line 4881, in map
    new_values = super()._map_values(mapper, na_action=na_action)
  File "/Users/louis/anaconda3/envs/timeflux_rasr-env/lib/python3.7/site-packages/pandas/core/base.py", line 1300, in _map_values
    new_values = map_f(values, mapper)
  File "pandas/_libs/lib.pyx", line 2228, in pandas._libs.lib.map_infer
ValueError: Invalid value NaN (not a number)