here is the crash report
if anyone can help me please

NETXMSD CRASH DUMP
Fri Aug 23 11:43:33 2019

EXCEPTION: C0000005 (Access violation) at 00007FFA6C85B4C6

NetXMS Version: 2.2.16
NetXMS Build Tag: 2.2.16
OS Version: Windows 8 Build 9200
Processor architecture: AMD64 (Intel EM64T)

Call stack:
  [nxcore:00007FFA6C85B4C6]: public: __cdecl Event::Event(class EventTemplate const * __ptr64,unsigned int,unsigned int,wchar_t const * __ptr64,char const * __ptr64,wchar_t const * __ptr64 * __ptr64,char * __ptr64) __ptr64
  [nxcore:00007FFA6C85D617]: public: struct json_t * __ptr64 __cdecl Event::toJson(void) __ptr64
  [nxcore:00007FFA6C85D6BD]: bool __cdecl PostEvent(unsigned int,unsigned int,char const * __ptr64,...)
  [nxcore:00007FFA6C842CFB]: public: void __cdecl DCObject::setStatus(int,bool) __ptr64
  [nxcore:00007FFA6C843A6E]: public: virtual void __cdecl DCObject::updateFromMessage(class NXCPMessage * __ptr64) __ptr64
  [nxcore:00007FFA6C838309]: public: void __cdecl DCItem::updateFromMessage(class NXCPMessage * __ptr64,unsigned int * __ptr64,unsigned int * __ptr64 * __ptr64,unsigned int * __ptr64 * __ptr64) __ptr64
  [nxcore:00007FFA6C8FA41A]: public: bool __cdecl Template::updateDCObject(unsigned int,class NXCPMessage * __ptr64,unsigned int * __ptr64,unsigned int * __ptr64 * __ptr64,unsigned int * __ptr64 * __ptr64,unsigned int) __ptr64
  [nxcore:00007FFA6C8D0680]: private: void __cdecl ClientSession::modifyNodeDCI(class NXCPMessage * __ptr64) __ptr64
  [nxcore:00007FFA6C8C9157]: private: void __cdecl ClientSession::processRequest(class NXCPMessage * __ptr64) __ptr64
  [nxcore:00007FFA6C830853]: bool __cdecl IsCommand(wchar_t const * __ptr64,wchar_t const * __ptr64,int)
  [libnetxms:00007FFA89647DC2]: enum TcpPingResult __cdecl TcpPing(class InetAddress const & __ptr64,unsigned short,unsigned int)
  [libnetxms:00007FFA8962C09F]: unsigned int __cdecl SEHThreadStarter(void * __ptr64)
  [ucrtbase:00007FFA9175FA95]: iswascii
  [KERNEL32:00007FFA945037E4]: BaseThreadInitThunk
  [ntdll:00007FFA94F7CB81]: RtlUserThreadStart