Plank crashes on start up

[Do Quyet]

I'm using plank, ver. 0.11.4.24-0a84. Window manager is gala (https://aur.archlinux.org/packages/gala-git). Here is the log I got from redirecting output when running cerbere (https://github.com/elementary/cerbere):

GApplication service mode takes no arguments.
** Message: 13:52:17.191: ProcessWrapper.vala:99: Process 'plank' watch exit
** Message: 13:52:17.192: ProcessWrapper.vala:111: Process plank is being terminated
** Message: 13:52:17.192: ProcessWrapper.vala:123: ET = 0.130327 secs Min allowed time = 3.500000

** (io.elementary.cerbere:6402): WARNING **: 13:52:17.192: ProcessWrapper.vala:128: PROCESS 'plank' CRASHED (#1)
** Message: 13:52:17.417: ProcessWrapper.vala:99: Process 'plank' watch exit
** Message: 13:52:17.417: ProcessWrapper.vala:111: Process plank is being terminated
** Message: 13:52:17.417: ProcessWrapper.vala:123: ET = 0.223935 secs Min allowed time = 3.500000

** (io.elementary.cerbere:6402): WARNING **: 13:52:17.417: ProcessWrapper.vala:128: PROCESS 'plank' CRASHED (#2)
** Message: 13:52:17.577: ProcessWrapper.vala:99: Process 'plank' watch exit
** Message: 13:52:17.577: ProcessWrapper.vala:111: Process plank is being terminated
** Message: 13:52:17.577: ProcessWrapper.vala:123: ET = 0.158868 secs Min allowed time = 3.500000

** (io.elementary.cerbere:6402): WARNING **: 13:52:17.577: ProcessWrapper.vala:128: PROCESS 'plank' CRASHED (#3)
** Message: 13:52:17.677: ProcessWrapper.vala:99: Process 'plank' watch exit
** Message: 13:52:17.677: ProcessWrapper.vala:111: Process plank is being terminated
** Message: 13:52:17.677: ProcessWrapper.vala:123: ET = 0.098315 secs Min allowed time = 3.500000

** (io.elementary.cerbere:6402): WARNING **: 13:52:17.677: ProcessWrapper.vala:128: PROCESS 'plank' CRASHED (#4)
** Message: 13:52:17.840: ProcessWrapper.vala:99: Process 'plank' watch exit
** Message: 13:52:17.840: ProcessWrapper.vala:111: Process plank is being terminated
** Message: 13:52:17.840: ProcessWrapper.vala:123: ET = 0.161237 secs Min allowed time = 3.500000

** (io.elementary.cerbere:6402): WARNING **: 13:52:17.840: ProcessWrapper.vala:128: PROCESS 'plank' CRASHED (#5)
** Message: 13:52:17.923: ProcessWrapper.vala:99: Process 'plank' watch exit
** Message: 13:52:17.924: ProcessWrapper.vala:111: Process plank is being terminated
** Message: 13:52:17.924: ProcessWrapper.vala:123: ET = 0.081257 secs Min allowed time = 3.500000

** (io.elementary.cerbere:6402): WARNING **: 13:52:17.924: ProcessWrapper.vala:128: PROCESS 'plank' CRASHED (#6)

** (io.elementary.cerbere:6402): WARNING **: 13:52:17.924: 'plank' exceeded the maximum number of crashes allowed (5). It won't be launched again

I'm also try plank in Arch repository, ver. 0.11.4-2 and got the same behaviour & log as above.

Output of plank -d:
[INFO 13:51:24.211678] [AbstractMain:229] Plank version: 0.11.4.24-0a84
[INFO 13:51:24.211741] [AbstractMain:230] Kernel version: 4.20.0-arch1-1-ARCH
[INFO 13:51:24.211790] [AbstractMain:231] GLib version: 2.58.2 (2.58.2)
[INFO 13:51:24.211838] [AbstractMain:234] GTK+ version: 3.24.2 (3.24.2)
[INFO 13:51:24.211884] [AbstractMain:237] Wnck version: 3.30.0
[INFO 13:51:24.211944] [AbstractMain:238] Cairo version: 1.16.0
[INFO 13:51:24.211996] [AbstractMain:239] Pango version: 1.42.3
[INFO 13:51:24.212042] [AbstractMain:241] + Cairo/Gtk+ HiDPI support enabled
[INFO 13:51:24.212088] [AbstractMain:247] + XInput Barriers support enabled
[CRITICAL 13:51:24.212238] [AbstractMain:257] Only X11 environments are supported.

X ver. 1.20.3-1
Graphics driver: f86-video-intel, ver. 1:2.99.917+855+g746ab3bb-1
Desktop Environment: Pantheon
Plank is installed from Arch AUR (https://aur.archlinux.org/packages/plank-git)

[Do Quyet (mr.quyetdx)]

Plank starts successfully if I add `export XDG_SESSION_TYPE=x11` in ~/.xinitrc.

[Nico (nicohood)]

The provided workaround does not work for me on archlinux. Will plank ever be fixed for wayland?