Returning strings from a dll and freeing C strings

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Leadwerks

I return strings from dlls like this:

global ReturnString:Byte ptr

Function GetString:Byte Ptr()
GCEnter()
ReturnString="Hello".tocstring()
return ReturnString
EndFunction

Now for the same of memory management, I believe it should be like this:

global ReturnString:Byte ptr

Function GetString:Byte Ptr()
GCEnter()
If ReturnString<>Null MemFree ReturnString
ReturnString="Hello".tocstring()
return ReturnString
EndFunction

However, this causes a crash in my program. Do I need to manually free the byte ptr like this?