Tia Maria caffeine?

I’ve been devastated all night because my dog accidentally spilled half my pint of rum and liquors store close early asf so no chance to buy more, however I did randomly remember that I had a full bottle of Tia Maria stashed in the cupboard. I’ve drank around 350ml so far and it’s grand, in these quantities it’s sweet and kinda tedious but I’ve drank much worse. I’m starting to wonder about the caffeine though because Google gave an absolutely nuts number at like 400mg per 100mls which is just bullshit so I’m just wondering if anyone has the real one.