autorelease pool page corrupted

Hi,

I used PyObjc in a python application for monitoring some global events:

class MacOSXEventMonitor():
    def init(self):
        log.debug("Initializing events monitor for Mac OS X...")

        self._observer =
NSEvent.addGlobalMonitorForEventsMatchingMask_handler_(
            NSLeftMouseDownMask
            | NSLeftMouseUpMask
            | NSRightMouseDownMask
            | NSRightMouseUpMask
            | NSMouseMovedMask
            | NSLeftMouseDraggedMask
            | NSRightMouseDraggedMask
            | NSMouseEnteredMask
            | NSMouseExitedMask
            | NSScrollWheelMask
            | NSKeyDownMask
            | NSKeyUpMask
            | NSAlphaShiftKeyMask
            | NSShiftKeyMask
            | NSControlKeyMask
            | NSAlternateKeyMask
            | NSCommandKeyMask
            | NSNumericPadKeyMask
            | NSHelpKeyMask
            | NSFunctionKeyMask
            | NSFlagsChangedMask, self.handleEvent)

    def handleEvent(self, event):
        # NSLog(u"%@", event)

    def stop(self):
        NSEvent.removeMonitor_(self._observer)

It is strange that each time when I exit the application, the following
error printed in console:

objc[8775]: autorelease pool page 0x1009e0000 corrupted
  magic 0x1009ff00 0xc0000000 0x00000000 0x60000000
  pthread 0x7fff7e917180

Also a system dialog shown (please see the screenshot attached).

Anyone encountered this before? Much appreciate for any suggestions/help.

Thanks,
Jake

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