Not sure of the repro steps. Open a payment handler and go back to payment sheet and back into the handler? 

```
[10973:10973:0621/143103.168253:FATAL:service_worker_payment_instrument.cc(285)] Check failed: delegate_. 
#0 0x7f417e7ddbcd base::debug::StackTrace::StackTrace()
#1 0x7f417e5264bc base::debug::StackTrace::StackTrace()
#2 0x7f417e5954ba logging::LogMessage::~LogMessage()
#3 0x565258f815ed payments::ServiceWorkerPaymentInstrument::OnPaymentAppInvoked()
#4 0x565258f87969 _ZN4base8internal13FunctorTraitsIMN8payments30ServiceWorkerPaymentInstrumentEFvN4mojo16InlinedStructPtrINS2_5mojom22PaymentHandlerResponseEEEEvE6InvokeISA_NS_7WeakPtrIS3_EEJS8_EEEvT_OT0_DpOT1_
#5 0x565258f87885 _ZN4base8internal12InvokeHelperILb1EvE8MakeItSoIMN8payments30ServiceWorkerPaymentInstrumentEFvN4mojo16InlinedStructPtrINS4_5mojom22PaymentHandlerResponseEEEENS_7WeakPtrIS5_EEJSA_EEEvOT_OT0_DpOT1_
#6 0x565258f87800 _ZN4base8internal7InvokerINS0_9BindStateIMN8payments30ServiceWorkerPaymentInstrumentEFvN4mojo16InlinedStructPtrINS3_5mojom22PaymentHandlerResponseEEEEJNS_7WeakPtrIS4_EEEEEFvS9_EE7RunImplISB_NSt3__15tupleIJSD_EEEJLm0EEEEvOT_OT0_NSI_16integer_sequenceImJXspT1_EEEEOS9_
#7 0x565258f87799 _ZN4base8internal7InvokerINS0_9BindStateIMN8payments30ServiceWorkerPaymentInstrumentEFvN4mojo16InlinedStructPtrINS3_5mojom22PaymentHandlerResponseEEEEJNS_7WeakPtrIS4_EEEEEFvS9_EE7RunOnceEPNS0_13BindStateBaseEOS9_
#8 0x7f4176c3499c _ZNO4base12OnceCallbackIFv13scoped_refptrIN3net23URLRequestContextGetterEEEE3RunES4_
#9 0x7f417886829f _ZN4base8internal13FunctorTraitsINS_12OnceCallbackIFvN4mojo16InlinedStructPtrIN8payments5mojom22PaymentHandlerResponseEEEEEEvE6InvokeISA_JS8_EEEvOT_DpOT0_
#10 0x7f417886817d _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoINS_12OnceCallbackIFvN4mojo16InlinedStructPtrIN8payments5mojom22PaymentHandlerResponseEEEEEEJSA_EEEvOT_DpOT0_
#11 0x7f4178868140 _ZN4base8internal7InvokerINS0_9BindStateINS_12OnceCallbackIFvN4mojo16InlinedStructPtrIN8payments5mojom22PaymentHandlerResponseEEEEEEJS9_EEEFvvEE7RunImplISB_NSt3__15tupleIJS9_EEEJLm0EEEEvOT_OT0_NSG_16integer_sequenceImJXspT1_EEEE
#12 0x7f4178868099 _ZN4base8internal7InvokerINS0_9BindStateINS_12OnceCallbackIFvN4mojo16InlinedStructPtrIN8payments5mojom22PaymentHandlerResponseEEEEEEJS9_EEEFvvEE7RunOnceEPNS0_13BindStateBaseE
#13 0x7f417e4d51ee _ZNO4base12OnceCallbackIFvvEE3RunEv
#14 0x7f417e527982 base::debug::TaskAnnotator::RunTask()
#15 0x7f417e5b4ad9 base::internal::IncomingTaskQueue::RunTask()
#16 0x7f417e5be667 base::MessageLoop::RunTask()
#17 0x7f417e5be8d8 base::MessageLoop::DeferOrRunPendingTask()
#18 0x7f417e5bec09 base::MessageLoop::DoWork()
#19 0x7f417e5c2a2c base::MessagePumpGlib::HandleDispatch()
#20 0x7f417e5c3181 base::(anonymous namespace)::WorkSourceDispatch()
#21 0x7f415d8dff07 g_main_context_dispatch
#22 0x7f415d8e0138 <unknown>
#23 0x7f415d8e01cc g_main_context_iteration
#24 0x7f417e5c2b1f base::MessagePumpGlib::Run()
#25 0x7f417e5bde5b base::MessageLoop::Run()
#26 0x7f417e6676ad base::RunLoop::Run()
#27 0x5652545bf5cf ChromeBrowserMainParts::MainMessageLoopRun()
#28 0x7f4177f84ee1 content::BrowserMainLoop::RunMainMessageLoopParts()
#29 0x7f4177f8d150 content::BrowserMainRunnerImpl::Run()
#30 0x7f4177f784a9 content::BrowserMain()
#31 0x7f4179d819d2 content::RunBrowserProcessMain()
#32 0x7f4179d83c0b content::ContentMainRunnerImpl::Run()
#33 0x7f4179d78515 content::ContentServiceManagerMainDelegate::RunEmbedderProcess()
#34 0x7f417ea7ede4 service_manager::Main()
#35 0x7f4179d7e775 content::ContentMain()
#36 0x565252931246 ChromeMain
#37 0x565252931152 main
#38 0x7f415b75d2b1 __libc_start_main

```