zahadna chyba nette/database

snazim se vlozit array do insertu a takhle zahadne mi to vraci tuto chybu, netusite?
pouzivam nette/database a postgresql 8.4

SQLSTATE[22P02]: Invalid text representation: 7 ERROR: array value must start with "{" or dimension information ŘÁDKA 1:

 $arr=array(//'id'=>null,
  'users_id'=>$userid,
 'docs_id'=>$docid,
 'telnumber'=>$telnumber,
 'cm'=>$cm,
 'keystring'=>$keystring,
 'inserttime'=>null,
 'status'=>"A",
 'paytype'=>"sms",
  'idt'=>$idt,
 'price'=>$price,
 'operator'=>$operator,
 'hashnumber'=>$number);

$payment= \Model\Payment::payments()->insert($arr);