Ground Loops with organelle?!

So i plugged my guitar to a passive spliter (namely, Electro Harmonix Switchblade plus) with one output goint to the amp and one output to the organelle. Whenever i do so i get annoying ground noise from the amp, even when the organelle’s output isnt connected to anything. Also, the amp and organelle are connected to the same power slot. Anyone knows a solution?