ver 5.5.19 used in hydrogen-5 them

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I can't save Styles in Hydrogen Theme under wordpress 6.54 Php 8.1 Error message : Trying to access array offset on value of type null wp-content/plugins/gantry5/src/classes/Leafo/ScssPhp/Compiler.php:5036

I know Gantry very little but I am quite surprised to see that SCSS compilation is done with such an old compiler. Leafo has not been maintained for a very long time