com_emerald errors on my Apache log file

Today I checked my Apache log file to debug for another issue, then I found newly records for com_emerald:

[root@iYhn8jd domains]# tail joomlagate.com.error.log

[Sun Apr 24 10:41:17.675559 2016] [:error] [pid 22006] [client 144.76.27.118:39926] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

[Sun Apr 24 10:41:17.677282 2016] [:error] [pid 22006] [client 144.76.27.118:39926] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

[Sun Apr 24 10:41:17.678165 2016] [:error] [pid 22006] [client 144.76.27.118:39926] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

[Sun Apr 24 10:41:17.679861 2016] [:error] [pid 22006] [client 144.76.27.118:39926] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

[Sun Apr 24 10:41:19.494582 2016] [:error] [pid 20860] [client 144.76.27.118:39927] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

[Sun Apr 24 10:41:19.496282 2016] [:error] [pid 20860] [client 144.76.27.118:39927] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

[Sun Apr 24 10:41:19.497165 2016] [:error] [pid 20860] [client 144.76.27.118:39927] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

[Sun Apr 24 10:41:19.498852 2016] [:error] [pid 20860] [client 144.76.27.118:39927] PHP Warning: in_array() expects parameter 2 to be array, null given in /home/gate.c/web/joomlagate.com/public_html/components/com_emerald/library/rules/com_remository/com_remository.php on line 29

My server system info: OS: CentOS 7 64-bit PHP: 5.5.33 DB: 5.5.44-MariaDB Emrald version: 9.402 Remository version: 3.56

Could you please check these records and tell me if it is something fatal? What should I do to fix them?

Thank you.