SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'player_id' cannot be null - laravel

Question

I have this error when I try to add data. I have 2 tables on my database, the (players) table and the (stats) table which are connected with the "player_id" being the foreign key to the players table.
players table:enter image description here
stats table:enter image description here
StatsController:
public function index(){
$stats = Stats::all();
return view('stats', ['stats' => $stats]);
}
public function addstats(){
if($this->request->method() == 'POST'){
$alert = request() -> validate([
'points' => 'required|numeric',
'average_points' => 'required|numeric',
'games' => 'required|numeric',
'duration' => 'required|numeric'
]);
$stats = new Stats;
$stats->player_id = $this->request->id;
$stats->points = $this->request->get('points');
$stats->average_points = $this->request->get('average_points');
$stats->games = $this->request->get('games');
$stats->duration = $this->request->get('duration');
if($stats -> save()){
echo 'Success';
}
}
return view('addstats', ['player_id' => $this->request->player_id]);
}
public function editstats(Stats $stats){
if($this->request->method() == 'POST'){
$alert = request() -> validate([
'points' => 'required|numeric',
'average_points' => 'required|numeric',
'games' => 'required|numeric',
'duration' => 'required|numeric'
]);
$stats->player_id = $this->request->id;
$stats->fullname = $this->request->get('points');
$stats->age = $this->request->get('average_points');
$stats->height = $this->request->get('games');
$stats->weight = $this->request->get('duration');
if($stats -> save()){
return redirect('stats/');
}
}
return view('editstats', ['stats' => $stats]);
}
public function destroy(Stats $stats){
$stats->delete();
return redirect('stats/');
}
addstats blade php:
#section('content')
<div class="container">
<form action="{{route('addstats')}}" method="POST">
#csrf
<input type="hidden" name="id" value="{{$player_id}}">
<p>Overall Points:</p>
<input type="number" name="points" class="form-control" value="{{Request::old('points')}}" required>
<p style="color: red">#error('points') {{$message}} #enderror</p>
<p>Average points per game:</p>
<input type="number" name="average_points" class="form-control" value="{{Request::old('average_points')}}" required>
<p style="color: red">#error('average_points') {{$message}} #enderror</p>
<p>Games:</p>
<input type="number" name="games" class="form-control" value="{{Request::old('games')}}" required>
<p style="color: red">#error('games') {{$message}} #enderror</p>
<p>Duration:</p>
<input type="number" name="duration" class="form-control" value="{{Request::old('duration')}}" required>
<p style="color: red">#error('duration') {{$message}} #enderror</p>
<button class="btn btn-primary">Submit</button>
</form>
</div>
#endsection
my Routes:
Route::middleware('auth')->group(function(){
Route::get('/', [PlayersController::class, 'index']);
Route::post('/addplayer', [PlayersController::class, 'addplayer'])->name('addplayer');
Route::get('/addplayer', [PlayersController::class, 'addplayer'])->name('addplayer');
Route::get('/editplayer/{players}', [PlayersController::class, 'editplayer'])->name('editplayer');
Route::post('/editplayer/{players}', [PlayersController::class, 'editplayer'])->name('editplayer');
Route::get('/destroy/{players}', [PlayersController::class, 'destroy'])->name('destroy');
Route::get('/stats/{player_id?}', [StatsController::class, 'index']);
Route::post('/addstats', [StatsController::class, 'addstats'])->name('addstats');
Route::get('/addstats', [StatsController::class, 'addstats'])->name('addstats');
Route::get('/editstats/{stats?}', [StatsController::class, 'editstats'])->name('editstats');
Route::post('/editstats/{stats?}', [StatsController::class, 'editstats'])->name('editstats');
Route::get('/destroy/{stats?}', [StatsController::class, 'destroy'])->name('destroy');
});
class Stats extends Model
{
use HasFactory;
protected $table = 'stats';
protected $fillable = [
'player_id','points','average_points','games','duration'
];
}