python API - cannot close after save because project is locked

Hello,

I have a problem when trying to close a project in a script, related to the fact that the project seems to be locked (there is indeed a .painter_lock file):

[Python] File "C:\Users/Fabien/OneDrive/Documents/Adobe/Adobe Substance 3D Painter/python\plugins\sbs_automation.py", line 468, in __call__
substance_painter.project.close()

[Python] File "C:\Program Files/Adobe/Adobe Substance 3D Painter/resources/python/modules\substance_painter\project.py", line 382, in close
_substance_painter.project.do_action(_substance_painter.project.Action.Lock)

[Python] _substance_painter.exception.ProjectError: Cannot do 'Lock' action from current 'Project locked' state

I cannot find a workaround to this problem, because even if a watch the exception, it seems that there is no event or operation related to locked status of the project.

Has anybody a solution to this problem ?

Thank you for your help