Bad definition of type text in file ext_tables.sql

[lexflex64]

In powermail 13.1.0 the fields text in ext_tables.sql are define with text,when you upddate database TYPO3 do
ALTER TABLE tx_powermail_domain_model_field ADD placeholder_repeat TEXT DEFAULT NULL

If you save a powermail you have this fatal error
Cannot assign null to property In2code\Powermail\Domain\Model\Field::$placeholderRepeat of type string

in older version the definition in ext_tables.sql is text NOT NULL,

[lexflex64]

all the field text nedd to be text NOT NULL it's the old configuration