diff -r 78b8abedb7f0 -r b717a552e63f src/NullByteHandler.h
--- a/src/NullByteHandler.h	Sat Dec 04 21:14:52 2021 +0100
+++ b/src/NullByteHandler.h	Sat Apr 23 11:29:21 2022 +0200
@@ -51,7 +51,8 @@
 	}
 
 	void attribute(const string_t& value) override {
-		output << convertor.to_bytes(value).c_str();
+		const std::string octets = convertor.to_bytes(value);
+		for (char ch : octets) output.put(ch ? ch : '@');
 		output.put(0);
 	}