Using Focuspoint with eager loading
After some research I found out that this problem has no simple solution (unfortunately). Check https://github.com/smcyr/Craft-FocusPoint/issues/10.

A solution would be not to use eager loading (obvious). Another solution could be using Craft3 (no plugin needed).

The solution I used was Focal Point (https://github.com/aelvan/FocalPointField-Craft). Focal Point is a tool that can be used with Eager Loading. Focal Point creates a focus point on every asset, that means not on every asset field.