Crash under X Server 1.20.11 using xf86-input-wizardpen 0.8.1-5

[jojolepro]

Tablet: XP-PEN Star G640
Behavior: can't open xorg display while tablet is plugged and driver is loaded. plugging tablet after xorg display is opened will also cause a crash.

.local/share/xorg/Xorg.0.log:
[ 478.866] (II) LoadModule: "wizardpen"
[ 478.866] (II) Loading /usr/lib/xorg/modules/input/wizardpen_drv.so
[ 478.867] (II) Module wizardpen: vendor="X.Org Foundation"
[ 478.867] compiled for 1.20.5, module version = 0.8.1
[ 478.867] Module class: X.Org XInput Driver
[ 478.867] ABI class: X.Org XInput driver, version 24.1
[ 478.867] (II) Using input driver 'wizardpen' for 'XP-PEN STAR G640 Mouse'
[ 478.867] (**) XP-PEN STAR G640 Mouse: always reports core events
[ 478.867] (**) Option "Device" "/dev/input/event4"
[ 478.867] (EE) xf86OpenSerial: Cannot open device /dev/input/event4
 Permission denied.
[ 478.867] (EE) XP-PEN STAR G640 Mouse: unable to open device
[ 478.867] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:28BD:0094.0002/input/input24/event4"
[ 478.867] (II) XINPUT: Adding extended input device "XP-PEN STAR G640 Mouse" (type: WizardPen Tablet, id 10)
[ 478.867] (EE) BUG: triggered 'if (dev->proximity != ((void *)0))'
[ 478.867] (EE) BUG: ../xorg-server-1.20.11/Xi/exevents.c:2077 in InitProximityClassDeviceStruct()
[ 478.867] (EE)
[ 478.867] (EE) Backtrace:
[ 478.867] (EE) 0: /usr/lib/Xorg (xorg_backtrace+0x53) [0x55c92ef55fd3]
[ 478.867] (EE) 1: /usr/lib/Xorg (InitProximityClassDeviceStruct+0x47) [0x55c92ef13367]
[ 478.867] (EE) 2: /usr/lib/xorg/modules/input/wizardpen_drv.so (0x7f3be27f7000+0x3729) [0x7f3be27fa729]
[ 478.867] (EE) 3: /usr/lib/Xorg (ActivateDevice+0x48) [0x55c92ee78d88]
[ 478.867] (EE) 4: /usr/lib/Xorg (0x55c92ee0f000+0x177bd3) [0x55c92ef86bd3]
[ 478.867] (EE) 5: /usr/lib/Xorg (0x55c92ee0f000+0x1bb112) [0x55c92efca112]
[ 478.867] (EE) 6: /usr/lib/Xorg (0x55c92ee0f000+0x1bb53b) [0x55c92efca53b]
[ 478.867] (EE) 7: /usr/lib/Xorg (InitInput+0xf5) [0x55c92ef7a475]
[ 478.867] (EE) 8: /usr/lib/Xorg (0x55c92ee0f000+0x39798) [0x55c92ee48798]
[ 478.867] (EE) 9: /usr/lib/libc.so.6 (__libc_start_main+0xd5) [0x7f41e77c5b25]
[ 478.867] (EE) 10: /usr/lib/Xorg (_start+0x2e) [0x55c92ee495de]
[ 478.867] (EE)
[ 478.867] (EE) XP-PEN STAR G640 Mouse: unable to allocate ProximityClassDeviceStruct
[ 478.867] (**) XP-PEN STAR G640 Mouse: (accel) keeping acceleration scheme 1
[ 478.867] (**) XP-PEN STAR G640 Mouse: (accel) acceleration profile 0
[ 478.867] (**) XP-PEN STAR G640 Mouse: (accel) acceleration factor: 2.000
[ 478.867] (**) XP-PEN STAR G640 Mouse: (accel) acceleration threshold: 4
[ 478.867] (EE) xf86OpenSerial: Cannot open device /dev/input/event4
 Permission denied.
[ 478.867] (WW) XP-PEN STAR G640 Mouse: cannot open input device /dev/input/event4: Permission denied
[ 478.867] [dix] couldn't enable device 10
[ 478.867] (EE) Couldn't init device "XP-PEN STAR G640 Mouse"
[ 478.867] (II) UnloadModule: "wizardpen"
[ 478.867] (EE)
[ 478.867] (EE) Backtrace:
[ 478.867] (EE) 0: /usr/lib/Xorg (xorg_backtrace+0x53) [0x55c92ef55fd3]
[ 478.868] (EE) 1: /usr/lib/Xorg (0x55c92ee0f000+0x151df5) [0x55c92ef60df5]
[ 478.868] (EE) 2: /usr/lib/libc.so.6 (0x7f41e779e000+0x3cda0) [0x7f41e77dada0]
[ 478.868] (EE) 3: /usr/lib/libc.so.6 (gsignal+0x142) [0x7f41e77dad22]
[ 478.868] (EE) 4: /usr/lib/libc.so.6 (abort+0x116) [0x7f41e77c4862]
[ 478.868] (EE) 5: /usr/lib/libc.so.6 (0x7f41e779e000+0x7ed28) [0x7f41e781cd28]
[ 478.868] (EE) 6: /usr/lib/libc.so.6 (0x7f41e779e000+0x8692a) [0x7f41e782492a]
[ 478.868] (EE) 7: /usr/lib/libc.so.6 (0x7f41e779e000+0x88408) [0x7f41e7826408]
[ 478.868] (EE) 8: /usr/lib/libc.so.6 (cfree+0x68) [0x7f41e78299e8]
[ 478.868] (EE) 9: /usr/lib/Xorg (xf86DeleteInput+0x20) [0x55c92ef865b0]
[ 478.868] (EE) 10: /usr/lib/Xorg (0x55c92ee0f000+0x177eea) [0x55c92ef86eea]
[ 478.868] (EE) 11: /usr/lib/Xorg (0x55c92ee0f000+0x1bb112) [0x55c92efca112]
[ 478.868] (EE) 12: /usr/lib/Xorg (0x55c92ee0f000+0x1bb53b) [0x55c92efca53b]
[ 478.868] (EE) 13: /usr/lib/Xorg (InitInput+0xf5) [0x55c92ef7a475]
[ 478.868] (EE) 14: /usr/lib/Xorg (0x55c92ee0f000+0x39798) [0x55c92ee48798]
[ 478.868] (EE) 15: /usr/lib/libc.so.6 (__libc_start_main+0xd5) [0x7f41e77c5b25]
[ 478.868] (EE) 16: /usr/lib/Xorg (_start+0x2e) [0x55c92ee495de]
[ 478.868] (EE)
[ 478.868] (EE)
Fatal server error:
[ 478.868] (EE) Caught signal 6 (Aborted). Server aborting
[ 478.868] (EE)
[ 478.868] (EE)