Invalid argument supplied for foreach()

hello, am using opencart 2.3.0.2 installation went smoothly buh each time i want to create a new account i keep getting this error message

Invalid argument supplied for foreach() in /home/leostore/public_html/system/engine/loader.php on line 53Notice: Undefined property: Proxy::getCustomerGroup in /home/leostore/public_html/catalog/model/account/customer.php on line 12


please how i can i fix this ??