ORA-20025 converting lead to contact

Question

I am trying to convert lead to contact and I get this error:

ORA-20025 common.exception.SfdcSqlException`
ORA-06512: at "SNEEZY.CACCESS", line 2399`
ORA-06512: at "SNEEZY.CACCESS", line 585`
ORA-06512: at "SNEEZY.CACCESS", line 656
ORA-06512: at "SNEEZY.CTASK", line 552
ORA-06512: at line 1

{call cTask.insert_tasks(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)}

{call cTask.insert_tasks(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)}`

I posted to SF community, spoke to a support member at SF. She said that if the community will not answer, one of their support specialists will pick it up. (which they did not thus far)

SF community post

I have read through most of the material about this error but no one seems to have resolved this.

My code is executed after insert:

Trigger AutoConvertLead2Contact on Lead (after insert) {

 for (Lead lead: Trigger.new) {
      if (!lead.isConverted && lead.LeadSource == 'אינטרנט') {
        Database.LeadConvert lc = new Database.LeadConvert();
        lc.setLeadId(lead.id);
        lc.setDoNotCreateOpportunity(true);

        LeadStatus convertStatus = [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true LIMIT 1];
        lc.setConvertedStatus(convertStatus.MasterLabel);

        Database.LeadConvertResult lcr = Database.convertLead(lc);
        System.assert(lcr.isSuccess());
        }
    }
}

I read somewhere that since its executed after insert it is somewhat too fast to convert right away and that it should be triggered a little but later...mmm
Has anyone encountered this ORA?
Anyone managed to solve the matter?
Thanx