ROS 7.1.1 and scripting problem

Hello,
after i upgrade ROS to 7.1.1 my script which find failed negotiations in L2TP IPSEC stop working.
I think this line stop working :local loglist [:toarray [/log find where topics~ipsec & time>([/system clock get time] - 6m) (message~“negotiation failed.$” || message~“src_ip”)]]
I am not able to get log messages for last 6 minutes. It resturns whole log.
Any idea why?
Thank you

Do this gives time -6 min?

:put ([/system clock get time] - 6m)