Steps to reproduce:

1. create Zabbix Agent item system.cpu.util[,guest_nice,avg1] for windows agent

Result:
Item became not supported with unstable reason:

  8202:20171102:033118.866 error reason for "Windows 2008 Server i386:system.cpu.util[,guest_nice,avg1]" changed: Unsupported item key.
  8202:20171102:033219.040 error reason for "Windows 2008 Server i386:system.cpu.util[,guest_nice,avg1]" changed: Invalid second parameter.

Expected:
Only one reason in this case should be: "Invalid second parameter."

This messages appeared in server log file after upgrade to 3.4 branch r73447. Prior revision was 72952.