xorg-server-1.20.9 crash on startup

NULL pointer dereference on startup, no problems with previous versions. gdb session follows.

(gdb) r :1 
Starting program: /m/src/X4/xserver/B/hw/xfree86/Xorg :1
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

X.Org X Server 1.20.9
X Protocol Version 11, Revision 0
Build Operating System: Linux 5.6.16 x86_64 
Current Operating System: Linux pc.localdomain 5.6.16 #6 SMP Wed Jun 3 11:54:28 CEST 2020 x86_64
Kernel command line: BOOT_IMAGE=/boot/linux-5.6.16 root=/dev/sda2 ro init=/sbin/init raid=noautodetect TERM=linux "RL=  "
Build Date: 26 August 2020  10:20:36AM
 
Current version of pixman: 0.40.0
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.1.log", Time: Wed Aug 26 10:23:39 2020
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using config directory: "/etc/X11/xorg.conf.d"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"


Program received signal SIGSEGV, Segmentation fault.
0x00000000004962c0 in xf86platformProbe () at ../../../../hw/xfree86/common/xf86platformBus.c:292
292	        if (pci && (strncmp(busid, "pci:", 4) == 0)) {
(gdb) p busid
$3 = 0x0
(gdb)