Error after updating to 13.1.7

[pbuenemann]

Hello,
I'm getting an error after updating from 13.0.2 to 13.1.7.

TypoScript:
main = {$cssRootPath}/style.scss
main.outputfile = {$cssRootPath}/style.css

TYPO3: 13.4.27

WapplerSystems\WsScss\Compiler::compileFile(): Argument #5 ($outputStyle) must be of type ?ScssPhp\ScssPhp\OutputStyle, string given, called in /html/typo3/typo3conf/ext/ws_scss/Classes/Hooks/RenderPreProcessorHook.php on line 157