Lux's ultimate can not be interrupted.

So a moment ago I picked Cassiopeia up against a Lux, just because I thought I could land a good ult before the enemy Lux could.

Although I successfully land a Petrifying Gaze in her face before she finished her ult, she is stunned, but the ult does not get disabled and I end up dying instead, this has happened twice in a row and I'm saying it's very infuriating,

Then I look at champions like Anivia, a simple silence, charm, stun, Thresh hook, Blitzcrank hook & knock up interrupts** ALL** her abilities, but when it comes to Lux, you just can not cancel her out for the life of you.

Please add some counter play to this champion.