Ionic Native/Google Maps: Marker click does not work in Marker Cluster

Hi, this is my first post so I’m not fully sure how to ask for help.

I’m using Ionic V3 and Ionic Native Google Maps V4.21 to show some different places and give then functionality.
I was using the markers without Cluster and it worked well, but now I’m trying to replace the Markers for a Marker Cluster and the click event shows me the error “Cannot read property ‘indexOf’ of undefined”

My code:

I’ve been spinning around this for some hours and really I don’t know what to do, I’m following the example of the docs, maybe it’s just my mistake.

Thanks and sorry if this post is bad written.