getting error in "delete CDocManager::pStaticDocManager;"

While running following code

if (CDocManager::pStaticDocManager != NULL)
  {
   delete CDocManager::pStaticDocManager;
   CDocManager::pStaticDocManager = NULL;
  }

exception "Unhandled exception at开发者_如何学Python 0x0041f09d in ChinaEncrypter.exe: 0xC0000005: Access violation reading location 0x00003130" is coming in delete statement.

*Note:*This error is coming only in release mode and pStaticDocManager is initialising only in release mode. In debug mode it is having NULL value during whole process.

Thanks in advance.

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Did you explicit initialize pStaticDocManager to NULL ?

Also make sure the instance pointed by pStaticDocManager have all its member correctly initialized.