X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/6d1138864fc75651ce79aa2748deb7feba1bac91..11cd814b19dd4278d51ab15c14e81fb8ee96777c:/misc.c

diff --git a/misc.c b/misc.c
index 78d829a9..09e6db57 100644
--- a/misc.c
+++ b/misc.c
@@ -181,6 +181,8 @@ void bufchain_add(bufchain *ch, const void *data, int len)
 {
     const char *buf = (const char *)data;
 
+    if (len == 0) return;
+
     ch->buffersize += len;
 
     if (ch->tail && ch->tail->buflen < BUFFER_GRANULE) {