See if you can find the crash ID or DMP file as per https://www.chromium.org/for-testers/bug-reporting-guidelines/reporting-crash-bug
Possibly related:  issue 680404 

68e3e18a-633c-4d2b-beff-fa9a3d72164e (Server ID: b32a52c680000000)

crash ID 68e3e18a-633c-4d2b-beff-fa9a3d72164e (Server ID: b32a52c680000000)

Seems like a duplicate of issue 685996

is there anyway to resolve the issue?

The stack trace of crash id :b32a52c680000000 is as follows:

Thread 0 CRASHED [EXCEPTION_ACCESS_VIOLATION_WRITE @ 0x00000000 ] MAGIC SIGNATURE THREAD
Stack Quality100%Show frame trust levels
0x00007ffe2900dcfa	(chrome.dll -cloud_policy_manager.cc:127 )	policy::CloudPolicyManager::CreateComponentCloudPolicyService(std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &,base::FilePath const &,scoped_refptr<net::URLRequestContextGetter> const &,policy::CloudPolicyClient *,policy::SchemaRegistry *)
0x00007ffe2901d5fa	(chrome.dll -user_cloud_policy_manager.cc:59 )	policy::UserCloudPolicyManager::Connect(PrefService *,scoped_refptr<net::URLRequestContextGetter>,std::unique_ptr<policy::CloudPolicyClient,std::default_delete<policy::CloudPolicyClient> >)
0x00007ffe2aa54d6d	(chrome.dll -user_policy_signin_service_base.cc:236 )	policy::UserPolicySigninServiceBase::InitializeUserCloudPolicyManager(std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &,std::unique_ptr<policy::CloudPolicyClient,std::default_delete<policy::CloudPolicyClient> >)
0x00007ffe2aa556ca	(chrome.dll -user_policy_signin_service.cc:140 )	policy::UserPolicySigninService::InitializeUserCloudPolicyManager(std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &,std::unique_ptr<policy::CloudPolicyClient,std::default_delete<policy::CloudPolicyClient> >)
0x00007ffe2a8b04b5	(chrome.dll -one_click_signin_sync_starter.cc:246 )	OneClickSigninSyncStarter::LoadPolicyWithCachedCredentials()
0x00007ffe2a8b014e	(chrome.dll -one_click_signin_sync_starter.cc:191 )	OneClickSigninSyncStarter::SigninDialogDelegate::OnContinueSignin()
0x00007ffe2b0dc4a4	(chrome.dll -profile_signin_confirmation_dialog_views.cc:248 )	ProfileSigninConfirmationDialogViews::ButtonPressed(views::Button *,ui::Event const &)
0x00007ffe2abaf8b5	(chrome.dll -custom_button.cc:465 )	views::CustomButton::NotifyClick(ui::Event const &)
0x00007ffe2abaf068	(chrome.dll -custom_button.cc:198 )	views::CustomButton::OnMouseReleased(ui::MouseEvent const &)
0x00007ffe2ab9302d	(chrome.dll -view.cc:1021 )	views::View::OnMouseEvent(ui::MouseEvent *)
0x00007ffe29e43a0d	(chrome.dll -event_handler.cc:27 )	ui::EventHandler::OnEvent(ui::Event *)
0x00007ffe29e44144	(chrome.dll -event_dispatcher.cc:191 )	ui::EventDispatcher::DispatchEvent(ui::EventHandler *,ui::Event *)
0x00007ffe29e43c22	(chrome.dll -event_dispatcher.cc:86 )	ui::EventDispatcherDelegate::DispatchEventToTarget(ui::EventTarget *,ui::Event *)
0x00007ffe29e43aac	(chrome.dll -event_dispatcher.cc:58 )	ui::EventDispatcherDelegate::DispatchEvent(ui::EventTarget *,ui::Event *)
0x00007ffe2abc12fd	(chrome.dll -root_view.cc:447 )	views::internal::RootView::OnMouseReleased(ui::MouseEvent const &)
0x00007ffe2ab98746	(chrome.dll -widget.cc:1211 )	views::Widget::OnMouseEvent(ui::MouseEvent *)
0x00007ffe29e43a0d	(chrome.dll -event_handler.cc:27 )	ui::EventHandler::OnEvent(ui::Event *)
0x00007ffe29e44144	(chrome.dll -event_dispatcher.cc:191 )	ui::EventDispatcher::DispatchEvent(ui::EventHandler *,ui::Event *)
0x00007ffe29e43c22	(chrome.dll -event_dispatcher.cc:86 )	ui::EventDispatcherDelegate::DispatchEventToTarget(ui::EventTarget *,ui::Event *)
0x00007ffe29e43aac	(chrome.dll -event_dispatcher.cc:58 )	ui::EventDispatcherDelegate::DispatchEvent(ui::EventTarget *,ui::Event *)
0x00007ffe2ac7c4c2	(chrome.dll -event_processor.cc:35 )	ui::EventProcessor::OnEventFromSource(ui::Event *)
0x00007ffe2ac7c759	(chrome.dll -event_source.cc:51 )	ui::EventSource::SendEventToProcessor(ui::Event *)
0x00007ffe2abdb91c	(chrome.dll -desktop_window_tree_host_win.cc:829 )	views::DesktopWindowTreeHostWin::HandleScrollEvent(ui::ScrollEvent const &)
0x00007ffe2abf30ec	(chrome.dll -hwnd_message_handler.cc:2526 )	views::HWNDMessageHandler::HandleMouseEventInternal(unsigned int,unsigned __int64,__int64,bool)
0x00007ffe2abed8fd	(chrome.dll -hwnd_message_handler.h:335 )	views::HWNDMessageHandler::_ProcessWindowMessage(HWND__ *,unsigned int,unsigned __int64,__int64,__int64 &,unsigned long)
0x00007ffe2abef6c2	(chrome.dll -hwnd_message_handler.cc:911 )	views::HWNDMessageHandler::OnWndProc(unsigned int,unsigned __int64,__int64)
0x00007ffe29b0f125	(chrome.dll -window_impl.cc:302 )	gfx::WindowImpl::WndProc(HWND__ *,unsigned int,unsigned __int64,__int64)
0x00007ffe29b0f14e	(chrome.dll -wrapped_window_proc.h:76 )	base::win::WrappedWindowProc<&gfx::WindowImpl::WndProc(HWND__ *,unsigned int,unsigned __int64,__int64)>(HWND__ *,unsigned int,unsigned __int64,__int64)
0x00007ffe58311168	(USER32.dll + 0x00011168 )	UserCallWinProcCheckWow
0x00007ffe58310c96	(USER32.dll + 0x00010c96 )	DispatchMessageWorker
0x00007ffe29775c19	(chrome.dll -message_pump_win.cc:363 )	base::MessagePumpForUI::ProcessMessageHelper(tagMSG const &)
0x00007ffe297757e1	(chrome.dll -message_pump_win.cc:169 )	base::MessagePumpForUI::DoRunLoop()
0x00007ffe29775413	(chrome.dll -message_pump_win.cc:56 )	base::MessagePumpWin::Run(base::MessagePump::Delegate *)
0x00007ffe2974cb72	(chrome.dll -run_loop.cc:35 )	base::RunLoop::Run()
0x00007ffe29658dd6	(chrome.dll -chrome_browser_main.cc:2010 )	ChromeBrowserMainParts::MainMessageLoopRun(int *)
0x00007ffe2911788c	(chrome.dll -browser_main_runner.cc:141 )	content::BrowserMainRunnerImpl::Run()
0x00007ffe2911054e	(chrome.dll -browser_main.cc:46 )	content::BrowserMain(content::MainFunctionParams const &)
0x00007ffe29607046	(chrome.dll -content_main_runner.cc:774 )	content::ContentMainRunnerImpl::Run()
0x00007ffe2870fd24	(chrome.dll -chrome_main.cc:108 )	ChromeMain
0x00007ff730a475e9	(chrome.exe -main_dll_loader_win.cc:174 )	MainDllLoader::Launch(HINSTANCE__ *,base::TimeTicks)
0x00007ff730a420d0	(chrome.exe -chrome_exe_main_win.cc:248 )	wWinMain
0x00007ff730ad1a42	(chrome.exe -exe_common.inl:253 )	__scrt_common_main_seh
0x00007ffe57ca8101	(KERNEL32.DLL + 0x00018101 )	BaseThreadInitThunk
0x00007ffe58fec5b3	(ntdll.dll + 0x0005c5b3 )	RtlUserThreadStart

The above stack trace looks similar to the issue id: 685996. Hence, merging into the issue id: 685996.

Thanks...!!

pb@hurunuicollege.school.nz: Could you please provide additional details for reproducing the issue? Is it happening for you reliably on each attempt to sign in? Do you switch between multiple Google accounts on the same machine, or the issue happens even when using a single account?

It happens on the same machine using a single account. 

Are there any platform policies enforced on this machine (can you attach a screenshot of the about://policy page before signing in)?

Does it only happen if you click "Link Data", or will it also happen if you click "Create new profile"?

Thanks for your help here - we've seen this crash a few times before but we've never been able to reproduce it ourselves. It's also useful to know if it happens on different machines, and if it happens with every account you sign in with (example: a random gmail account) or just with your school.nz acct?