尝试读取 null 上的属性“密码”

Question

我创建了更改密码的函数，但出现错误异常（尝试在 null 上读取属性“密码”）。有人可以建议处理这个例外吗？

public function passwordUpdate(Request $request){
        // return $request->input();
        $rules=[
            'password'=>'required',
            'newpassword'=>'required',
            'cannewpassword'=>'same:newpassword'
        ];
        $custommsg=[
            'password.required'=>'Old password must be filled out.',
            'newpassword.required'=>'New password must be filled out.',
            'cannewpassword.required'=>'Confirm password must be filled out.',
        ];
        $validate=Validator::make($request->all(),$rules,$custommsg);
        if($validate->fails()){
            return redirect('change-password')->withErrors($validate);
        }
        else{
             $check=Hash::check($request->password,auth()->user()->password);
             if($check){
                $user=User::find(auth()->user()->id);
                $user->update(['password'=>Hash::make($request->newpassword)]);
                return redirect('change-password')->with('msg','Password Updated Successfully!');
             }
             else{
                return redirect('change-password')->with('msg',"You have entered wrong Password!");
             }

        }

       
    }