Laravel 5 use Constraint Eager Loading with NULL

I have this line of code:

$route = Route::with(array('fromStation', 'toStation', 'country', 'region', 'account', 'nodes.station'))->findOrFail($id);

I have table routes and route_nodes. In route_nodes i have column named station_id which is foreign key to table stations. It can be NULL.

When I execute line above I get exception: Call to a member function addEagerConstraints() on null

So I guess problem is that I have some NULL values for station_id in table route_nodes.

What is the solution for this? Should I load without station, and then for each node on which station is not null load station model?

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