Do I need to call DeAllocateLStrHandleArray?

Compiled a VI as a DLL. One of the outputs is an array of LabVIEW strings. Interface defines the call as:

int32_t __cdecl function(..., LStrHandleArray *X, ...);

and gives me three managing functions

LStrHandleArray __cdecl AllocateLStrHandleArray (int32 elmtCount);
MgErr __cdecl ResizeLStrHandleArray (LStrHandleArray *hdlPtr, int32 elmtCount);
MgErr __cdecl DeAllocateLStrHandleArray (LStrHandleArray *hdlPtr);

 I allocate a LStrHandArray to pass to my function and call the function as

  LStrHandleArray X = AllocateLStrHandleArray(0);
  MgErr error = function(..., &X, ...);

Everything works fine.  Do I need to call?

MgErr error DeAllocateLStrHandleArray (&X);

If I do it returns an error (18438).  Not too worried about not calling it, as the code exits a couple of lines below, but just wondering what it is and how to convert that to an error message.