Resolved Errors importing Virtuemart Products

Hello, i think that the Vrituemart plugin need to be updated for newer version of PHP.
I'm trying to export Virtuemart product from a joomla3 to a Virtuemart4 in Joomla4.
Export is fine, when i try to import preview is good but when i start the actual import i got a lot of errors (one for each line of the CSV):

Status error: 200
Status message: parsererror

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home/***/domains/***.com/public_html/plugins/csviaddon/virtuemart/com_virtuemart/model/import/product.php on line 441

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home/***/domains/***.com/public_html/plugins/csviaddon/virtuemart/com_virtuemart/model/import/product.php on line 441

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home/***/domains/***.com/public_html/plugins/csviaddon/virtuemart/com_virtuemart/model/import/product.php on line 441

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home/***/domains/***.com/public_html/plugins/csviaddon/virtuemart/com_virtuemart/model/import/product.php on line 441

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home/***/domains/***.com/public_html/plugins/csviaddon/virtuemart/com_virtuemart/model/import/product.php on line 441

....

I've enabled logs that says that everything went ok but products are not imported.
Thanks