Undefined offset: 2 in freelancer_zymphonies_theme_preprocess_page()

Problem/Motivation

The following notice appears after enabling theme:

Notice: Undefined offset: 2 in freelancer_zymphonies_theme_preprocess_page() (line 132 of themes/contrib/freelancer_zymphonies_theme/freelancer_zymphonies_theme.theme).

freelancer_zymphonies_theme_preprocess_page(Array, 'page', Array) (Line: 287)
Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 431)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer->render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 100)
__TwigTemplate_8bd99adc7e8b9e85c3f65e6d6be66213074fefce88f71e907af9b14f6ec6a473->doDisplay(Array, Array) (Line: 455)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 422)
Twig\Template->display(Array) (Line: 434)
Twig\Template->render(Array) (Line: 64)
twig_render_template('themes/contrib/freelancer_zymphonies_theme/templates/layout/html.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 431)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer->render(Array) (Line: 147)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 148)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
call_user_func(Array, Object, 'kernel.view', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156)
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: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

This bug has already been reported twice. See #3166848: Patch and Fix: Undefined offset warning and #2830710: Undefined offset warning.
Both have been closed without the bug being fixed.

Steps to reproduce

1. Turn on error messages (Administration » Configuration » Development » Logging and errors: All messages, with backtrace information)
2. Download version 2.0.2 of the theme with composer.
3. Install and set as default
4. Visit site: The Notice appears.

If it don't appear rebuild cache.

Proposed resolution

Install the path supplied.

Conduct internal training session to educate the zymphonies-team to have logging and errors enabled in the zymphonies development environment.