Found this bug when trying to repro crbug.com/860670. 
When try to login into a child account it keeps crashing in the processor code.
Henrique, could you help to take a look?


stack trace:
[5793:5793:0709/133834.527121:FATAL:values.cc(268)] Check failed: is_dict(). 
#0 0x000008f881d0 base::debug::StackTrace::StackTrace()
#1 0x000008f31b0c logging::LogMessage::~LogMessage()
#2 0x000008f816a6 base::Value::FindKey()
#3 0x0000083cb0e6 chromeos::usage_time_limit::internal::Override::Override()
#4 0x0000083cb486 chromeos::usage_time_limit::GetState()
#5 0x0000083c92da chromeos::ScreenTimeController::CheckTimeLimit()
#6 0x0000083ca458 chromeos::ScreenTimeController::OnSessionStateChanged()
#7 0x00000a6d3134 session_manager::SessionManager::SetSessionState()
#8 0x0000084845f0 chromeos::ChromeSessionManager::SessionStarted()
#9 0x000008484498 chromeos::(anonymous namespace)::StartUserSession()
#10 0x000008484120 chromeos::ChromeSessionManager::Initialize()
#11 0x0000083cf6cc chromeos::ChromeBrowserMainPartsChromeos::PostProfileInit()
#12 0x000008d1c64a ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#13 0x000008d1be3c ChromeBrowserMainParts::PreMainMessageLoopRun()
#14 0x0000083ced02 chromeos::ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun()
#15 0x000007cc7ada content::BrowserMainLoop::PreMainMessageLoopRun()
#16 0x000007f44784 content::StartupTaskRunner::RunAllTasksNow()
#17 0x000007cc6a52 content::BrowserMainLoop::CreateStartupTasks()
#18 0x000007cc94e4 content::BrowserMainRunnerImpl::Initialize()
#19 0x000007cc5262 content::BrowserMain()
#20 0x000008d115f0 content::ContentMainRunnerImpl::Run()
#21 0x000008d16e12 service_manager::Main()
#22 0x000008d10172 content::ContentMain()
#23 0x0000075fa92c ChromeMain
#24 0x0000ed9f68a0 __libc_start_main