diff --git a/libs/sofia-sip/.update b/libs/sofia-sip/.update
index 84d396ff55..93e9497fa0 100644
--- a/libs/sofia-sip/.update
+++ b/libs/sofia-sip/.update
@@ -1 +1 @@
-Wed Dec 11 15:38:35 MST 2019
+Fri Jan 17 15:37:19 UTC 2020
diff --git a/libs/sofia-sip/libsofia-sip-ua/tport/tport_logging.c b/libs/sofia-sip/libsofia-sip-ua/tport/tport_logging.c
index ac6003fb0b..7ffe33ac41 100644
--- a/libs/sofia-sip/libsofia-sip-ua/tport/tport_logging.c
+++ b/libs/sofia-sip/libsofia-sip-ua/tport/tport_logging.c
@@ -866,7 +866,9 @@ void tport_log_msg(tport_t *self, msg_t *msg,
       }
 
       n = su_strncspn(s, end - s, "\r\n");
-
+      if (buffer_pos > buffer_size) {
+        break;
+      } 
       bytes_written = snprintf(buffer + buffer_pos, buffer_size - buffer_pos, "%.*s", (int)n, s);
       if (bytes_written > 0) {
         buffer_pos += bytes_written;