Uploading SSH Key Throws Stack Trace

Uploading an SSH Key generates the error "Unexpected field 'SshKey.keyFile.full_path' in POST data" with the stack trace:

CORE/Cake/Controller/Component/SecurityComponent.php line 247 → SecurityComponent->_validatePost(SshKeysController)
CORE/Cake/Utility/ObjectCollection.php line 129 → SecurityComponent->startup(SshKeysController)
CORE/Cake/Event/CakeEventManager.php line 244 → ObjectCollection->trigger(string)
CORE/Cake/Controller/Controller.php line 683 → CakeEventManager->dispatch(CakeEvent)
CORE/Cake/Routing/Dispatcher.php line 189 → Controller->startupProcess()
CORE/Cake/Routing/Dispatcher.php line 167 → Dispatcher->_invoke(SshKeysController, CakeRequest)
APP/webroot/index.php line 96 → Dispatcher->dispatch(CakeRequest, CakeResponse)