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);