Error Call to a member function store() on null

In my project I'm using livewire functionality for updating the value. But in this case if I upload an image it send me an error.

Error
Call to a member function store() on null

Can anyone please tell me how can i solve this. I read the documentation and follow as he mentioned but i did not understand whats wrong with with this function.

This is livewire component method

use WithFileUploads;

public $admin_panel_value;
public $admin_alt_text;

    public $admin_logo;
 public function adminLogoDataSave()
    {
        $this->validate([
            'admin_alt_text' => 'required|string|max:50',
            // 'admin_photo' => 'image|mimes:png,jpg|max:102400', // 1MB Max
        ]);

        $adminLogo = Logo::where('options','admin_panel_logo')->findOrFail(1);

        $pic = $this->admin_logo->store('photos');

        // dd($pic);

        // $adminLogo->update([
        //     'alt_text' => $this->admin_alt_text,
        // ]);
    }

and this livewire blade component

   <form wire:submit.prevent="adminLogoDataSave" enctype="multipart/form-data">
            <div class="card-body">

                <div class="form-group">
                    <label for="logotext">Logo Text</label>
                    <input
                        type="text"
                        name="admin_alt_text"
                        wire:model.defer="admin_alt_text"
                        class="form-control"
                        id="logotext" aria-describedby="logotext"
                    >
                    @error('admin_alt_text')<span class="text-danger">{{ $message }}</span> @enderror
                </div>

                <div class="form-group">
                    <input type="text" value="{{ $admin_panel_value->options }}">
                </div>


                <div class="form-group">
                    <label for="admin_logo">Select Logo</label>
                    <input
                        type="file"
                        name="admin_logo"
                        wire:model="admin_logo"
                        class="form-control-file"
                        id="admin_logo">
                    <small id="logo_path" class="form-text text-muted">JPEG, PNG only</small>
                    @error('admin_logo') <span class="error">{{ $message }}</span> @enderror
                </div>
            </div>

            <div class="card-footer border-top white-bg text-right">
                <button type="submit" class="btn btn-primary">Save</button>
            </div>
        </form>