Exception when sizes is undefined

[ataker]

Get the following error when my sizes (for some reason) were undefined.

Slim Application Error
The application could not run because of the following error:

Details

Type: ErrorException
Code: 8
Message: Undefined variable: sizes
File: /var/www/html/wordpress/wp-content/plugins/thermal-api/api/v1/controllers/Posts.php
Line: 589
Trace

#0 /var/www/html/wordpress/wp-content/plugins/thermal-api/api/v1/controllers/Posts.php(589): Slim\Slim::handleErrors(8, 'Undefined varia...', '/var/www/html/w...', 589, Array)
#1 /var/www/html/wordpress/wp-content/plugins/thermal-api/api/v1/controllers/Posts.php(337): Voce\Thermal\v1\Controllers\Posts::_format_image_media_item(57)
#2 [internal function]: Voce\Thermal\v1\Controllers\Posts::format(Object(WP_Post), 0, 'read')
#3 /var/www/html/wordpress/wp-content/plugins/thermal-api/api/v1/controllers/Posts.php(35): array_walk(Array, Array, 'read')
#4 [internal function]: Voce\Thermal\v1\Controllers\Posts::find(Object(Slim\Slim))
#5 /var/www/html/wordpress/wp-content/plugins/thermal-api/api/API_Base.php(87): call_user_func_array(Array, Array)
#6 [internal function]: Voce\Thermal\{closure}()
#7 /var/www/html/wordpress/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Router.php(172): call_user_func_array(Object(Closure), Array)
#8 /var/www/html/wordpress/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Slim.php(1222): Slim\Router->dispatch(Object(Slim\Route))
#9 /var/www/html/wordpress/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Middleware/Flash.php(86): Slim\Slim->call()
#10 /var/www/html/wordpress/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Middleware/MethodOverride.php(94): Slim\Middleware\Flash->call()
#11 /var/www/html/wordpress/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
#12 /var/www/html/wordpress/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Slim.php(1174): Slim\Middleware\PrettyExceptions->call()
#13 /var/www/html/wordpress/wp-content/plugins/thermal-api/dispatcher.php(57): Slim\Slim->run()
#14 [internal function]: Voce\Thermal\API_Dispatcher->dispatch_api('')
#15 /var/www/html/wordpress/wp-includes/plugin.php(503): call_user_func_array(Array, Array)
#16 /var/www/html/wordpress/wp-settings.php(374): do_action('wp_loaded')
#17 /var/www/html/wordpress/wp-config.php(104): require_once('/var/www/html/w...')
#18 /var/www/html/wordpress/wp-load.php(37): require_once('/var/www/html/w...')
#19 /var/www/html/wordpress/wp-blog-header.php(12): require_once('/var/www/html/w...')
#20 /var/www/html/wordpress/index.php(17): require('/var/www/html/w...')
#21 {main}

Taking a look in controllers/Posts.php, it's easy to see that $sizes is defined in an if statement and then used outside of it. I've fixed this for myself, but I'm sure should be fixed.