drupal, ubercart checkout: unsupported operand types

Ik had Drupal 7, Ubercart 3 met betaalmodule idealubercart (van TargetPay) bijna aan de praat en kreeg deze error bij betalen:

Fatal error: Unsupported operand types in
/drupal_root/sites/all/modules/ubercart/
payment/uc_payment/uc_payment_checkout_pane.inc
on line 85

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