'Insert Variable' functionality in templares does not work (Exception, call on null)

[Emanuel-23]

In Magento 2.3.5 and Magento 2.4 as well, i can not make the variables to work.

When you try to create or edit a PDF template and press the 'insert variable' button an error occures:

Error: Call to a member function getId() on null in /app/web/vendor/magento/module-email/Block/Adminhtml/Template/Edit.php:295
...

I managed to find the potential cause for this, in Line 134-136 of /Controller/Adminhtml/Variable/Template.php
bute evene if i changed it to something like this (as copied from module-email), its not fixed (but then you even will get json response...)

$templateBlock = $this->_view->getLayout()->createBlock(
                \Magento\Email\Block\Adminhtml\Template\Edit::class,
                'template_id',
                [
                    'data' => [
                        'email_template' => $template
                    ]
                ]
            );

I assume that there have to be made several changes in order to make it compatible to the code of module-email.
Actually there are many parts of the code which seem to be deprecated, so this might not be the only problem. Hard to say at this point... But might be a starting point for someone that had the same issue.

[udovicic]

I can confirm that this is an issue on 2.3.5 and later

[chequille]

Hi, everybody,
facing similar problem within 2.4.1
I am using layout definitions in the template like
{{layout area="frontend" handle="jscdesign_shipment_date" shipment=$shipment order=$order}}
But it generates as well the errors Call to member function on null

DId some body find a solution already?
Regards,
Chequille

Additional info:
The above layout handle is calling a template but shipment and order data is not available there and therefore causes the error.
In the template $shipment could be called with $shipment = $block->getShipment()
Unfortunately not working anymore. It worked in 2.3.5 very good and stable.

[amelojunior]

the problem is here:

Pdfgenerator/Model/Template/Processor.php::processTemplate()

Setting setStrictMode to 0 fix this bug.

$processor->setStrictMode(0);

[rudracomputech]

I am using Magento version 2.3.5-p1 and also having same error.
Fatal error: Uncaught Error: Call to a member function getId() on null
And cant get variables value on pdf, Please help to solve this issue.