xrdp error on centos7.4

[moobyfr]

Testing xrdp on centos7.4 I got the following error
(xrdp from git master, xrorgxrdp from git master)

starting Xorg, I get the following in .xorgxrdp.XX.log:

[20171122-21:22:13] [ERROR] X error [BadWindow (invalid Window parameter)](3) opcodes 18/0 resource 0x1400166
[20171122-21:22:13] [ERROR] X error [BadWindow (invalid Window parameter)](3) opcodes 25/0 resource 0x1400166
[20171122-21:22:14] [ERROR] X error [BadWindow (invalid Window parameter)](3) opcodes 18/0 resource 0x14001ab
[20171122-21:22:14] [ERROR] X error [BadWindow (invalid Window parameter)](3) opcodes 25/0 resource 0x14001ab
[20171122-21:22:14] [ERROR] X error [BadWindow (invalid Window parameter)](3) opcodes 18/0 resource 0x14001ab
[20171122-21:22:14] [ERROR] X error [BadWindow (invalid Window parameter)](3) opcodes 25/0 resource 0x14001ab

And gnome-session-daemon makes an error at same time
traps: gnome-settings-[12123] trap divide error ip:7f56b1f74979 sp:7ffeb71be370 error:0 in libcolor.so[7f56b1f6d000+d000]

Some non-common entries in .xorgxrdp.XX.log:

[  2236.189] rdpRRCrtcGetGamma: 0x55a877f4b080 (nil) (nil) (nil)
[  2238.371] rdpkeybChangeKeyboardControl:
[  2238.371] rdpkeybChangeKeyboardControl: autoRepeat off
[  2238.371] rdpkeybChangeKeyboardControl:
[  2238.371] rdpkeybChangeKeyboardControl: autoRepeat off
[  2238.626] rdpRRCrtcGetGamma: 0x55a877f4b080 0x55a87825acd0 0x55a878261f70 0x55a878261fa0

[moobyfr]

resolved with #111