Error while creating an order manually from Admin Dashboard

[henkvalk]

While creating an order in the Admin area, an error will shown up when selecting a Payment Method.

Deprecated Functionality json_decode(); passing NULL to paramater #1 ($json) of type string is deprecated in /data/web/deployer_production/releases/77/vendor/magento/framework/Serialize/Serializer/Json.php on line 41

It is not possible to select a Shipping Method.

When I turn off the Productflow module, the error is gone.

[remcom]

@henkvalk We attempted to reproduce the error you’re experiencing but were unable to do so. Could you let us know which Magento version you’re using? Additionally, could you provide more details about the steps you took? I was still able to select a payment method without any issues appearing. Do you have a full stack trace of the error?

[henkvalk]

At the moment the error is gone after upgrading, but there are no shipping options available after selecting a payment method.

[remcom]

Just to make sure I understand correctly: When the ProductFlow module is disabled, you can see the shipping options, but when the module is enabled, no shipping methods appear?

When you’re testing this, do you notice any exceptions in the Magento logs?

[henkvalk]

Just to make sure I understand correctly: When the ProductFlow module is disabled, you can see the shipping options, but when the module is enabled, no shipping methods appear?

When you’re testing this, do you notice any exceptions in the Magento logs?

Hi, Thats correct. In the logfiles nothing shown up. Also no message inside the Magento admin. Only a scroll to top after clicking on the button for getting shipping options.