I am just trying to use a lattice deformer but somehow I can't see any available objects in the objects property.
Using Blender 2.79b under macOS High Sierra.
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You have to add a lattice object to the scene (Shift+A> Lattice). Then, after selecting the object you want to add the lattice to then the lattice (the order matters), you can do Ctrl+P> Lattice deform.