trigger on case causing problem please help

trigger casefromweb on Case (after insert) {
CaseTeamTemplate ctt = [Select Id From CaseTeamTemplate where Name = 'second case team' limit 1];
    for(case c1:trigger.new)
    {
       if(c1.Origin=='web')
        {
            CaseTeamTemplateRecord cttr = new CaseTeamTemplateRecord(TeamTemplateId = ctt.Id, ParentId = c1.ParentId);
upsert cttr;
        }
    }
}