Call to a member function update() on null in laravel - laravel

Question

So i want to make admin can change any user's password. but i got this error
Call to a member function update() on null
I have no idea what to do
this is my controller
public function resetPassword(Request $req, $id)
{
$req->validate([
'new_password' => ['required'],
'new_confirm_password' => ['same:new_password'],
],
[
'new_password.required' => 'Password Baru Harus Diisi !',
'new_confirm_password.same' => 'Password Baru Harus Sama Dengan Confirm Password !',
]);
User::find($id)->update(['password'=> Hash::make($req->new_password)]);
return redirect('/admin/list_user')->with('status', 'Password Berhasil di Ubah !');
}
this my route
Route::put('/admin/{id}/reset/password', 'PageController#resetPassword')->name('resetPassword');
this is my view modal
<div class="modal fade" id="resetModal" tabindex="-1" role="dialog" aria-labelledby="resetModal" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Reset Password</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form action="/admin/{id}/reset/password" method="POST">
{{csrf_field()}}
{{ method_field('PUT') }}
<div class="form-group">
<label for="password">Password Baru</label>
<input name="new_password" type="password" class="form-control" id="new_password" required>
</div>
<div class="form-group">
<label for="password">Confirm Password</label>
<input name="new_confirm_password" type="password" class="form-control" id="new_confirm_password" required>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-danger" data-dismiss="modal">Tutup</button>
<button type="submit" class="btn btn-primary">Buat</button>
</form>
</div>
</div>
</div>
</div>
</div>

Answer 1

<form action="/admin/{id}/reset/password" method="POST">
You're not passing any id. The route picks up '{id}' as the id, then tries to find an User with the id '{id}' and finds none. (->first() returns null).
Just change that opening form tag's action attribute:
<form action="{{ route('resetPassword', ['id' => Auth::id()]) }}" method="POST"> (or instead of Auth::id() the user_id you're trying to update.
You could also use findOrFail($id) instead of find($id) so you'll get a clearer error message if an User is not found.