Call to a member function sync() on null (Many to Many Relation)

I have a Many-to-Many relation and want to store data. However, I get a Call to a member function sync() on null problem. I think everything is good, therefore I can absolutely not say what the problem is!

Here are my Models

class Service extends Model
{
  public function locations(){
    $this->belongsToMany('aquaact\Location','location_service','service_id','location_id');
  }
}


class Location extends Model
{
  public function services(){
   $this->belongsToMany('aquaact\Service','location_service','location_id','service_id');
  }
}

Here is my store function that is called in the LocationController. The Post data shows, that $request->services has data.

public function store(Request $request)
{
 ...
 $location = new Location;
 ...
 $location->save();
 $location->services()->sync($request->services, false);
 ...
}

The error is showing that the sync line has an error. What can I do?

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