Slim Application Error

The application could not run because of the following error:

Details

Type: Exception
Message: Undefined property "material_id" for core/category
File: /home/i/icetomcat4/private/System/Entity/AbstractEntity.php
Line: 1160

Trace

#0 /home/i/icetomcat4/private/System/Entity/AbstractEntity.php(266): System\Entity\AbstractEntity->__setProperty('material_id', '0')
#1 /home/i/icetomcat4/private/System/Entity/AbstractEntity.php(221): System\Entity\AbstractEntity->__set('material_id', '0')
#2 /home/i/icetomcat4/private/System/Entity/AbstractEntity.php(87): System\Entity\AbstractEntity->initialize(Array)
#3 /home/i/icetomcat4/private/System/Entity/AbstractEntity.php(147): System\Entity\AbstractEntity->__construct(Object(Application\Core\Model\Category\Category), Array)
#4 /home/i/icetomcat4/private/System/Entity/AbstractEntityPrototype.php(483): System\Entity\AbstractEntity::create(Object(Application\Core\Model\Category\Category), Array)
#5 /home/i/icetomcat4/private/System/Entity/AbstractDataMapper.php(284): System\Entity\AbstractEntityPrototype->createEntity(Array)
#6 /home/i/icetomcat4/private/System/Entity/AbstractDataMapper.php(186): System\Entity\AbstractDataMapper->createEntity(Array)
#7 /home/i/icetomcat4/private/System/Entity/AbstractDataMapper.php(116): System\Entity\AbstractDataMapper->findFirst(Array)
#8 /home/i/icetomcat4/private/System/Entity/AbstractEntityPrototype.php(625): System\Entity\AbstractDataMapper->findFirstIdentity(Array)
#9 /home/i/icetomcat4/private/System/Entity/EntityPrototype.php(120): System\Entity\AbstractEntityPrototype->findFirstIdentity(Array)
#10 /home/i/icetomcat4/private/Application/Core/Controller/FrontController.php(104): System\Entity\EntityPrototype::findFirstIdentity_s(Object(System\Kernel), Array)
#11 [internal function]: Application\Core\Controller\FrontController->Application\Core\Controller\{closure}()
#12 /home/i/icetomcat4/vendor/slim/slim/Slim/Slim.php(1208): call_user_func_array(Object(Closure), Array)
#13 /home/i/icetomcat4/vendor/slim/slim/Slim/Slim.php(1349): Slim\Slim->applyHook('slim.before.rou...')
#14 /home/i/icetomcat4/vendor/slim/slim/Slim/Middleware/Flash.php(85): Slim\Slim->call()
#15 /home/i/icetomcat4/vendor/slim/slim/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()
#16 /home/i/icetomcat4/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
#17 /home/i/icetomcat4/vendor/slim/slim/Slim/Slim.php(1300): Slim\Middleware\PrettyExceptions->call()
#18 /home/i/icetomcat4/private/System/Kernel.php(472): Slim\Slim->run()
#19 /home/i/icetomcat4/public_html/index.php(7): System\Kernel->run()
#20 {main}