Issue With Arithmetic Parsing in Stellaris #54

I'm currently using a Stellaris Ascension Perks modifier that throws an error on parsing from CWTools. It looks as follows:
modifier = { weapon_archaeotech_weapon_damage_mult = @[ 0.33 - ( 0.06 * sartek_acg_mod_active ) ] }
This modifier is valid, I've tested in-game and it works exactly as written. 0.27 when the variable is inactive, 0.33 when the variable is active. When using the CWTools parser from Irony Mod Manager, I get the following error:

The file with the modifier is provided below as a reference.
~z_sartek_ascmgr_perks.txt