KxSMBItemFile::close crash.

[solidusex]

@implementation KxSMBItemFile {

• (void) close { if (_impl) {

  KxSMBFileImpl *p = _impl;
  _impl = nil;
  
  KxSMBProvider *provider = [KxSMBProvider sharedSmbProvider];
  [provider dispatchAsync:^{ [p closeFile]; }];         
  

  } }

...

Excuse me, can you explain here, why has an async call to close it? May crash in some case.