Cannot submit payment from back end when tax and invoicing disabled

Hi @mattwire Keep getting this warning in drupal log and return back at to payment page without processing payment.

Warning: number_format() expects parameter 1 to be float, string given in CRM_Core_Payment_Stripe->getAmount() (line 178 of /home/webadmin/public_html/cmm/sites/default/files/civicrm/ext/com.drastikbydesign.stripe/CRM/Core/Payment/Stripe.php).

I am using civicrm 5.20.2 Stripe 6.3a1, mjshared 6.1