[CentOS] rkhunter 1.4.2 (epel) unary operator expected -ne found

Anyone seeing this?

/etc/cron.daily/rkhunter:

/usr/bin/rkhunter: regel 13967: [: eenzijdige operator werd verwacht, -ne gevonden

Translating: line 13967 unary operator expected -ne found

Line 13967 is: if [ `${IPCS_CMD} -u 2>/dev/null | awk -F' ' '/segments allocated/ {print $3}'` -ne 0 ]; then

rkhunter 1.4.2 release 1.el6 from epel on a CentOS 6.5

Thanks
Patrick