tested both 1.8.9 and 1.8 developer build from february 7

going to configuration -> hosts, clicking on "items", expanding filter and :

• clearing out host field;
• selecting "Templates" in the group field;
• entering "10" in the update interval field
  and clicking "filter" results in a half-loaded page and the following in the apache error log :

PHP Fatal error: Unsupported operand types in zabbix_1.8.9/include/triggers.inc.php on line 1354, referer: items.php?filter_set=1&hostid=100100000017576&sid=3b0220b99073aca9

didn't seem to be reproducible on my test install with php 5.3.3 or 5.3.5, though