@@ -135,10 +135,13 @@
 			ret |= c + 10 - 'A';
 		else
 			return 0xFFFF;
 	}
 
+	if (ret == 0)
+		return 0xFFFF;
+
 	return ret;
 }
 
 static inline OFString*
 parseString(const char *restrict *pointer, const char *stop,