diff --git a/libs/io_utils/pistreampacker.cpp b/libs/io_utils/pistreampacker.cpp
index c16db3b0..9b67e18f 100644
--- a/libs/io_utils/pistreampacker.cpp
+++ b/libs/io_utils/pistreampacker.cpp
@@ -73,6 +73,7 @@ void PIStreamPacker::send(const PIByteArray & data) {
 	} else
 		hdr << int(cd.size_s());
 	cd.insert(0, hdr);
+	if (max_packet_size <= 0) return;
 	int pcnt = (cd.size_s() - 1) / max_packet_size + 1, pst = 0;
 	for (int i = 0; i < pcnt; ++i) {
 		if (i == pcnt - 1)