how to handle Error

[fgthhhh]

i have a code like this

_IENavigate($oIE, $grouplink,0)
    _IELoadWait($oIE, 0, 30000)
    $Forms = _IEFormGetCollection($oIE)
    For $Form in $Forms
        If StringInStr( $Form.id, "group-join") Then 
            $Submit = _IEFormElementGetObjByName( $Form, "submit")
            _IEAction( $Submit, "click")
            Sleep($time*1000)
        EndIf   
    Next    
EndFunc

it work but every time it get error, a error msgbox show up and after that my program quit

i wanna know how to ignore this error and continue my loop or just quit the loop and continue my program