error: (4, 'Interrupted system call')

[CaptiveFabry0]

When opening a shell on a pc, after few seconds I get this error and the connection ends (Saying that there's no screen to be attached). I have to unplug the raspberry to make it work again.

Traceback (most recent call last):
File "P4wnP1.py", line 1346, in
p4wnp1.cmdloop()
File "/usr/lib/python2.7/cmd.py", line 142, in cmdloop
stop = self.onecmd(line)
File "/usr/lib/python2.7/cmd.py", line 221, in onecmd
return func(arg)
File "P4wnP1.py", line 646, in do_shell
self.client_call_create_shell_proc()
File "P4wnP1.py", line 489, in client_call_create_shell_proc
self.interactWithClientProcess(proc.id)
File "P4wnP1.py", line 197, in interactWithClientProcess
if select.select([sys.stdin], [], [], 0.05)[0]: # 50 ms timeout, to keep CPU load low
error: (4, 'Interrupted system call')
Cleaning Up..