Fatal error: Call-time pass-by-reference has been removed in CRM\Contribute\Form\Contribution\Main.php on line 1198

On 4.2 beta 4 I came across this error while trying to access my basic contribution page:
index.php?q=civicrm/contribute/transact&reset=1&id=1

Fatal error: Call-time pass-by-reference has been removed in C:\htdocs\sites\all\modules\civicrm\CRM\Contribute\Form\Contribution\Main.php on line 1198

Not sure how my contribution page is different to other users that it hasn't been noticed.

The link corresponds to:
CRM_Price_BAO_FieldValue::getValues($priceField->id,&$values);
Removing the & from this line
CRM_Price_BAO_FieldValue::getValues($priceField->id,$values);
The result is that the suggested donation amounts on the contribution pages have disappeared.

I expected that I should add the & signs where the function is defined but it is defined here at the & sign is there for the second argument:
static function getValues($fieldId, &$values, $orderBy = 'weight', $isActive = FALSE) {

So not sure how to fix the problem.