删除文件错误

I am trying to delete a file after I delete the product from the database, but it shows me an error, and I cannot find a solution.

Call to a member function delete() on null

public function supprod($id,Request $request)
{
    $produits=Produit::find($id);
    $produits->delete();  // <-- error on this line
    $filename=(string)$document->nom;
    Storage::disk('fichier')->delete($filename);
    return redirect()->back();
  }

Image of the problem

this is check the record this function $produits=Produit::find($id); This use $produits=Produit::where('id',$id)->first();

You should really let Laravel do the work for you.

Change your action to:

 public function supprod(Produit $id, Request $request) {
       $filename=(string)$id->nom;
       Storage::disk('fichier')->delete($filename);
       $id->delete();
       return redirect()->back();
 }

This will make the framework find the appropriate model or throw a 404 error if it does not exist.

More information in the implicit model binding section of the documentation