diff --git a/src/webserver.c b/src/webserver.c
index 31ccd86e..ee2387c5 100644
--- a/src/webserver.c
+++ b/src/webserver.c
@@ -2044,7 +2044,10 @@ int ws_copyfile(WS_CONNINFO *pwsc, IOHANDLE hfile, uint64_t *bytes_copied) {
         bytes_written = bytes_read;
         if(!io_write(pwsc->hclient,buf,&bytes_written)) {
             ws_dprintf(L_WS_LOG,"Write error: %s\n",io_errstr(pwsc->hclient));
-            *bytes_copied = total_bytes;
+
+	    if (bytes_copied)
+	      *bytes_copied = total_bytes;
+
             return FALSE;
         }