PHP ERROR: Type: 1, File: /usr/local/pkg/haproxy/haproxy.inc

[Sergei_Shablovsky]

Dear pfSense Gurus!

Is anyone able to explain the source of this repeated error (pfSense CE, latest with all official patches):

PHP ERROR: Type: 1, File: /usr/local/pkg/haproxy/haproxy.inc, Line: 1542, Message: Uncaught TypeError: fwrite(): Argument #1 ($stream) must be of type resource, bool given in /usr/local/pkg/haproxy/haproxy.inc:1542
Stack trace:
#0 /usr/local/pkg/haproxy/haproxy.inc(1542): fwrite()
#1 /usr/local/pkg/haproxy/haproxy.inc(2516): haproxy_writeconf()
#2 /usr/local/pkg/haproxy/haproxy.inc(1349): haproxy_check_run()
#3 Standard input code(5): haproxy_configure()
#4 {main}
  thrown

After cold reboot this error disappear.

After 10-30 days this error appear again.

Disks system and controller are double checked twice: no errors.

Thank You all!