- atags for null pointers have no meaning so do not assert on them.

src/scripting/vm/vmbuilder.cpp

@@ -281,8 +281,8 @@ unsigned VMFunctionBuilder::GetConstantAddress(void *ptr, VM_ATAG tag)
 	AddrKonst *locp = AddressConstantMap.CheckKey(ptr);
 	if (locp != NULL)
 	{
-		// There should only be one tag associated with a memory location.
-		assert(locp->Tag == tag);
+		// There should only be one tag associated with a memory location. Exceptions are made for null pointers that got allocated through constant arrays.
+		assert(ptr == nullptr || locp->Tag == tag);
 		return locp->KonstNum;
 	}
 	else

src/v_draw.cpp

@@ -523,8 +523,6 @@ bool DCanvas::ParseDrawTextureTags (FTexture *img, double x, double y, DWORD tag
 	// doubles when passed as function arguments.)
 	while (tag != TAG_DONE)
 	{
-		DWORD data;
-
 		switch (tag)
 		{
 		default: