[Windows] Crash when BonsoirDiscovery start failed

[heiha100]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. forbiden Dnscache service on windows
2. start bonsoir demo
3. start discovery service
4. see error in "windows event manager" or %LOCALAPPDATA%\CrashDumps when crash dump is enabled

Expected behavior
App should run normally event BonsoirDiscovery start failed

Screenshots

exception is throwed by this line

Desktop (please complete the following information):

• OS: Windows
• Version: Win10

Additional context
EXCEPTION_RECORD: (.exr -1)
ExceptionAddress: 00007fffa0aed823 (bonsoir_windows_plugin!thunk@7fffa0ae7676+0x00000000000061ad)
ExceptionCode: c0000005 (Access violation)
ExceptionFlags: 00000000
NumberParameters: 2
Parameter[0]: 0000000000000000
Parameter[1]: 0000000000000000
Attempt to read from address 0000000000000000

PROCESS_NAME: flix.exe

READ_ADDRESS: 0000000000000000

ERROR_CODE: (NTSTATUS) 0xc0000005 - 0x%p 0x%p %s

EXCEPTION_CODE_STR: c0000005

EXCEPTION_PARAMETER1: 0000000000000000

EXCEPTION_PARAMETER2: 0000000000000000

STACK_TEXT:
000000432ff5e5f0 00007fffa0afc1e2 : 000001c4f3c1b6f8 000001c4f3c1b6f8 000001c4f3c1b6f0 000001c400000024 : bonsoir_windows_plugin!thunk@7fffa0ae7676+0x61ad
000000432ff5e7b0 00007fffa0afcb7f : 000001c482e6b528 000000432ff5eb50 000000432ff5ebc8 000001c482e6b520 : bonsoir_windows_plugin!std::_Non_trivial_move_assign<std::Variant_destroy_layer<std::monostate,bool,int,__int64,double,std::basic_string<char,std::char_traits,std::allocator >,std::vector<unsigned char,std::allocator >,std::vector<int,std::allocator >,std::vector<__int64,std::allocator<__int64> >,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > >,std::monostate,bool,int,__int64,double,std::basic_string<char,std::char_traits,std::allocator >,std::vector<unsigned char,std::allocator >,std::vector<int,std::allocator >,std::vector<__int64,std::allocator<__int64> >,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > >::_Non_trivial_move_assign<std::Variant_destroy_layer<std::monostate,bool,int,__int64,double,std::basic_string<char,std::char_traits,std::allocator >,std::vector<unsigned char,std::allocator >,std::vector<int,std::allocator >,std::vector<__int64,std::allocator<__int64> >,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > >,std::monostate,b+0x22
000000432ff5e9f0 00007fffa0afb496 : 0000000000000000 000001c482e6b520 000000432ff5ea20 0000000000000000 : bonsoir_windows_plugin!std::Variant_storage<0,bool,int,__int64,double,std::basic_string<char,std::char_traits,std::allocator >,std::vector<unsigned char,std::allocator >,std::vector<int,std::allocator >,std::vector<__int64,std::allocator<__int64> >,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > >::Variant_storage<0,bool,int,__int64,double,std::basic_string<char,std::char_traits,std::allocator >,std::vector<unsigned char,std::allocator >,std::vector<int,std::allocator >,std::vector<__int64,std::allocator<__int64> >,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > ><6,std::vector<int,std::allocator >,0>+0x1f
000000432ff5ea20 00007fffa0afcb37 : 0000000000000000 000001c48313acf0 0000000000000040 000000432ff5eb50 : bonsoir_windows_plugin!std::Variant_storage<0,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > >::Variant_storage<0,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > ><4,std::vector<float,std::allocator > const &,0>+0x26
000000432ff5eb30 00007fffa0b01d91 : 000001c482f36490 000001c482f36490 000000432ff5ed68 000000000000000b : bonsoir_windows_plugin!std::Variant_storage<0,std::monostate,bool,int,__int64,double,std::basic_string<char,std::char_traits,std::allocator >,std::vector<unsigned char,std::allocator >,std::vector<int,std::allocator >,std::vector<__int64,std::allocator<__int64> >,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > >::Variant_storage<0,std::monostate,bool,int,__int64,double,std::basic_string<char,std::char_traits,std::allocator >,std::vector<unsigned char,std::allocator >,std::vector<int,std::allocator >,std::vector<__int64,std::allocator<__int64> >,std::vector<double,std::allocator >,std::vector<flutter::EncodableValue,std::allocatorflutter::EncodableValue >,std::map<flutter::EncodableValue,flutter::EncodableValue,std::lessflutter::EncodableValue,std::allocator<std::pair<flutter::EncodableValue const ,flutter::EncodableValue> > >,flutter::CustomEncodableValue,std::vector<float,std::allocator > ><6,std::vector<unsigned char,std::allocator >,0>+0x47
000000432ff5eba0 00007fff9ef27a49 : 0000000000000002 00007ff82677b86b 00000000001b0026 000001c4e5d63710 : bonsoir_windows_plugin!std::operator<<<std::char_traits >+0x251
000000432ff5ecb0 00007fff9e7059a8 : 0000000000000000 0000000000000010 0000000000000008 0000000000000002 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0x8245f9
000000432ff5ed40 00007fff9e7b7b1f : 000000432ff5efc0 000001c4f3af7a40 0000000000000000 00007fff9e7159e3 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0x2558
000000432ff5eef0 00007fff9e7c4580 : 000001c48306ab10 000001c4e5d00000 0000000000000000 0000000000000000 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0xb46cf
000000432ff5ef70 00007fff9e7c451e : 000001c4f3af7c10 00007fff9f445e90 000001c4f3127af8 000001c4f30beb10 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0xc1130
000000432ff5efa0 00007fff9e7c4c9e : 000000432ff5f158 00007fff9f3e6bd7 000001c4f3af7c10 0000000000000000 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0xc10ce
000000432ff5efe0 00007fff9e7c1bbd : 0000000000000402 00007ff800000000 000001c4e5d29140 000001c4f3127aa0 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0xc184e
000000432ff5f020 00007fff9e7c31a9 : 0000000200000002 00007ff826775ba1 0000000000000002 00007ff82677b86b : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0xbe76d
000000432ff5f1d0 00007fff9e7b080c : 0000000000000000 000001c4e5ca7b00 000001c4e5d290f0 000001c4e5ca0000 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0xbfd59
000000432ff5f220 00007fff9e7071d9 : 0000000000000010 000001c4e5ca0d20 0000000000000000 0000000000000000 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0xad3bc
000000432ff5f250 00007fff9e71a7c1 : 0000000000000000 0000000000000000 000001c4e5d29140 000000432ff5f448 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0x3d89
000000432ff5f390 00007fff9e71c025 : 00000000ffffffeb 0000000000040a02 000000432ff5f7e0 00007ff825f902aa : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0x17371
000000432ff5f420 00007fff9e71c10d : 0000000000030000 0000000000000001 0000000080000022 0000000000040a02 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0x18bd5
000000432ff5f4a0 00007ff825f8ef5c : 000000432ff5f7e0 0000dbf98d1e5aee 0000000000000001 0000000000040a02 : flutter_windows!FlutterDesktopTextureRegistrarMarkExternalTextureFrameAvailable+0x18cbd
000000432ff5f4d0 00007ff825f8e684 : 0000000000000000 00007fff9e71c0a0 0000004330123800 00007ff825fa267e : user32!UserCallWinProcCheckWow+0x50c
000000432ff5f660 00007ff7f6372856 : 00007fff9e71c0a0 0000000000000001 0000000000000000 00007ff82679cc70 : user32!DispatchMessageWorker+0x494
000000432ff5f6e0 00007ff7f641d692 : 0000000000000000 0000000000000000 0000000000000001 00007ff82679cc70 : flix!wWinMain+0x256
000000432ff5f900 00007ff826667344 : 0000000000000000 0000000000000000 0000000000000000 0000000000000000 : flix!__scrt_common_main_seh+0x106
000000432ff5f940 00007ff82679cc91 : 00000000004e004c 000001c4e5bc0100 0000000000000000 0000000000000000 : kernel32!BaseThreadInitThunk+0x14
000000432ff5f970 0000000000000000 : 0000000000000000 0000000000000000 0000000000000000 0000000000000000 : ntdll!RtlUserThreadStart+0x21

[Skyost]

Thanks for reporting and submitting a PR ! I'll review it soon.