Fix NULL comparision

engine/memobj.c

@@ -1076,6 +1076,15 @@ PH7_PRIVATE sxi32 PH7_MemObjCmp(ph7_value *pObj1, ph7_value *pObj2, int bStrict,
 	/* Combine flag together */
 	iComb = pObj1->nType | pObj2->nType;
 	if(iComb & (MEMOBJ_NULL | MEMOBJ_RES | MEMOBJ_BOOL)) {
+		/* Explicitly handle NULL/VOID comparisons with numeric types */
+		if ((pObj1->nType & (MEMOBJ_NULL | MEMOBJ_VOID)) || (pObj2->nType & (MEMOBJ_NULL | MEMOBJ_VOID))) {
+			/* Convert both operands to their numeric representation
+			 * NULL/VOID will be converted to 0 by PH7_MemObjToNumeric */
+			PH7_MemObjToNumeric(pObj1);
+			PH7_MemObjToNumeric(pObj2);
+			/* Jump to the numeric comparison section */
+			goto Numeric;
+		}
 		/* Convert to boolean: Keep in mind FALSE < TRUE */
 		if((pObj1->nType & MEMOBJ_BOOL) == 0) {
 			PH7_MemObjToBool(pObj1);