500 error when obtaining posts

[AndreiBelokopytov]

My WP version is 3.9.2

Details

Type: ErrorException
Code: 8
Message: Undefined index: height
File: /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/api/v1/controllers/Posts.php
Line: 541
Trace
#0 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/api/v1/controllers/Posts.php(541): Slim\Slim::handleErrors(8, 'Undefined index...', '/home/rsdkalug/...', 541, Array)
#1 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/api/v1/controllers/Posts.php(309): Voce\Thermal\v1\Controllers\Posts::_format_image_media_item(1182)
#2 [internal function]: Voce\Thermal\v1\Controllers\Posts::format(Object(WP_Post), 2, 'read')
#3 /home/rsdkalug/data/www/rsd40.org/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 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/api/API_Base.php(87): call_user_func_array(Array, Array)
#6 [internal function]: Voce\Thermal{closure}()
#7 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Router.php(172): call_user_func_array(Object(Closure), Array)
#8 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Slim.php(1222): Slim\Router->dispatch(Object(Slim\Route))
#9 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Middleware/Flash.php(86): Slim\Slim->call()
#10 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Middleware/MethodOverride.php(94): Slim\Middleware\Flash->call()
#11 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
#12 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/vendor/slim/slim/Slim/Slim.php(1174): Slim\Middleware\PrettyExceptions->call()
#13 /home/rsdkalug/data/www/rsd40.org/wp-content/plugins/thermal-api/dispatcher.php(57): Slim\Slim->run()
#14 [internal function]: Voce\Thermal\API_Dispatcher->dispatch_api('')
#15 /home/rsdkalug/data/www/rsd40.org/wp-includes/plugin.php(470): call_user_func_array(Array, Array)
#16 /home/rsdkalug/data/www/rsd40.org/wp-settings.php(373): do_action('wp_loaded')
#17 /home/rsdkalug/data/www/rsd40.org/wp-config.php(96): require_once('/home/rsdkalug/...')
#18 /home/rsdkalug/data/www/rsd40.org/wp-load.php(29): require_once('/home/rsdkalug/...')
#19 /home/rsdkalug/data/www/rsd40.org/wp-blog-header.php(12): require_once('/home/rsdkalug/...')
#20 /home/rsdkalug/data/www/rsd40.org/index.php(17): require('/home/rsdkalug/...')
#21 {main}