PS 8.2 Error in module Products as Fake Combinations

[Amadek]

I want to use module Products as Fake Combinations - Link products together but i get error.

After installing the module, I try to go to edit products and get this error:

Warning: Undefined array key "selected"

PrestaShop\PrestaShop\Core\Exception\ CoreException
in classes/Hook.php (line 431)

                    }
                }
            } catch (Exception $e) {
                $environment = ServiceLocator::get('\\PrestaShop\\PrestaShop\\Adapter\\Environment');
                if ($environment->isDebug()) {
                    throw new CoreException($e->getMessage(), $e->getCode(), $e);
                }
            }
            return '';
        }

HookCore::callHookOn(object(ProductAsCombinations), 'displayAdminProductsExtra', array('_ps_version' => '8.2.0', 'request' => object(Request), 'route' => 'admin_products_edit', 'id_product' => 4, 'cookie' => object(Cookie), 'cart' => null, 'altern' => 1)) in classes/Hook.php (line 983)

                    // we will pass the response from the previous one as parameters.
                    if (0 !== $key && true === $chain) {
                        $hook_args = $output;
                    }
                    $display = Hook::callHookOn($moduleInstance, $registeredHookName, $hook_args);
                    // Case 1 - each module response to different array key. We don't care about the response.
                    if ($array_return) {
                        $output[$moduleInstance->name] = $display;
                    // Case 2 - chaining. Here, each module MUST return an array that will the next module receive as parameters.

HookCore::exec('displayAdminProductsExtra', array('_ps_version' => '8.2.0', 'request' => object(Request), 'route' => 'admin_products_edit', 'id_product' => 4, 'cookie' => object(Cookie), 'cart' => null, 'altern' => 1), 106, true) in src/Adapter/LegacyHookSubscriber.php (line 127)

            $content = Hook::exec(
                $hookName,
                $event->getHookParameters(),
                $moduleId,
                ($event instanceof RenderingHookEvent)
            );
            if (
                $event instanceof RenderingHookEvent
                && 0 !== $moduleId

What could be the cause of the error? Have you encountered such an error with this module?