TypeError for page after redirect

[bartdigitalpulse]

Everytime we visit a url that is redirected by the Retour plugin we get an TypeError. Stack trace below.
Example redirect: https://mywebsite.com/nl/category/entry-slug-2 (no longer exists) to https://mywebsite.com/nl/entry-slug-2

The "category/entry-slug-2" does not exist in the cache folder. "category/entry-slug" exists. Tried to refresh cache but it doesn't work.

PHP version 8.1.20
Database driver & version MySQL 8.0.33
Craft edition & version Craft Pro 4.4.5
Blitz 4.4.4

TypeError: putyourlightson\blitz\services\GenerateCacheService::save(): Argument #1 ($content) must be of type string, null given, called in /vendor/putyourlightson/craft-blitz/src/services/CacheRequestService.php on line 413
#8 /vendor/putyourlightson/craft-blitz/src/services/GenerateCacheService.php(397): putyourlightson\blitz\services\GenerateCacheService::save
#7 /vendor/putyourlightson/craft-blitz/src/services/CacheRequestService.php(413): putyourlightson\blitz\services\CacheRequestService::saveAndPrepareResponse
#6 /vendor/putyourlightson/craft-blitz/src/Blitz.php(307): putyourlightson\blitz\Blitz::putyourlightson\blitz\{closure}
#5 [internal](0): call_user_func
#4 /vendor/yiisoft/yii2/base/Event.php(312): yii\base\Event::trigger
#3 /vendor/yiisoft/yii2/base/Component.php(642): yii\base\Component::trigger
#2 /vendor/yiisoft/yii2/web/Response.php(340): yii\web\Response::send
#1 /vendor/yiisoft/yii2/base/Application.php(390): yii\base\Application::run
#0 /index.php(12): null

[bencroker]

Thanks for reporting this! Fixed in 04fdcd4 for the next release.

[bencroker]

Released in version 4.4.7.