Error - Non-numeric booking price type id provided.

#0 /justshopit/hans.test.comasys.dk/jsit/core/booking/cases/Model/BookingCalculator.php(328): Admin\Products\Model\BookingPriceType::getById(NULL)
#1 /var/www/vhosts/hans.test.comasys.dk/application/JS/design/front/rent_lejfesten/templates/partials/shop/relatedProducts.phtml(296): Booking\Cases\Model\BookingCalculator::getPriceRateData('6547', 1)
#2 /justshopit/hans.test.comasys.dk/Libraries/Akazell/View.class.php(22): require('/var/www/vhosts...')
#3 /justshopit/hans.test.comasys.dk/Libraries/Akazell/View/Helper/Partial.class.php(36): Akazell_View->render()
#4 [internal function]: Akazell_View_Helper_Partial->partial('relatedProducts...', Array, 'shop')
#5 /justshopit/hans.test.comasys.dk/Libraries/Akazell/View/Abstract.class.php(148): call_user_func_array(Array, Array)
#6 /var/www/vhosts/hans.test.comasys.dk/application/JS/design/front/rent_lejfesten/templates/shop/product.phtml(1113): Akazell_View_Abstract->__call('partial', Array)
#7 /var/www/vhosts/hans.test.comasys.dk/application/JS/design/front/rent_lejfesten/templates/shop/product.phtml(1113): Shop_View->partial('relatedProducts...', Array, 'shop')
#8 /justshopit/hans.test.comasys.dk/Libraries/Akazell/View.class.php(22): require('/var/www/vhosts...')
#9 /justshopit/hans.test.comasys.dk/Libraries/Akazell/Controller.class.php(226): Akazell_View->render()
#10 /justshopit/hans.test.comasys.dk/legacy/Modules/Shop/Classes/Controller.class.php(53): Akazell_Controller->output()
#11 /justshopit/hans.test.comasys.dk/Libraries/JS/Router/Akazell.php(262): Shop_Controller->output()
#12 /justshopit/hans.test.comasys.dk/Libraries/JS/JS.php(443): JS\Router\Akazell::dispatch('graa-wire-2aase...')
#13 /var/www/vhosts/hans.test.comasys.dk/httpdocs/index.php(103): JS\JS::run('graa-wire-2aase...')
#14 {main}