Error from adding new Module

I've been working on this all day, but I can't seem to add a new module. Every time I get this error: The website encountered an unexpected error. Please try again later. Error: Call to a member function id() on null in Drupal\opigno_module\Form\OpignoModuleForm->save() (line 312 of modules/contrib/opigno_module/src/Form/OpignoModuleForm.php). Drupal\opigno_module\Form\OpignoModuleForm->save(Array, Object) call_user_func_array(Array, Array) (Line: 111) Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51) Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 590) Drupal\Core\Form\FormBuilder->processForm('opigno_module_form', Array, Object) (Line: 319) Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 61) Drupal\Core\Entity\EntityFormBuilder->getForm(Object) (Line: 20) Drupal\opigno_module\Controller\LearningPathController->addIndex() call_user_func_array(Array, Array) (Line: 123) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() (Line: 582) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() (Line: 151) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 693) Drupal\Core\DrupalKernel->handle(Object) (Line: 19) This is the affected code: $route_params = current(\Drupal::routeMatch()->getParameters()); $group_id = $route_params['group']->id(); Given the above code, it appears as though there's a missing parameterof group id from the form's POST. Does anyone know if this is a bug or caused by a third-party module? Or any other explanation would be appreciated. Thanks in advance.