1 files changed, 4 insertions, 3 deletions

diff --git a/src/gnunet-gtk.c b/src/gnunet-gtk.c
index c33fed5e..252faa31 100644
--- a/src/gnunet-gtk.c
+++ b/src/gnunet-gtk.c
@@ -291,9 +291,10 @@ gnunet_gtk_select (void *cls,
     for (i = 0; !need_realloc && i < max_nfds; i += 1)
     {
       int isset[3];
-      isset[0] = FD_ISSET (i, &rfds->sds);
-      isset[1] = FD_ISSET (i, &wfds->sds);
-      isset[2] = FD_ISSET (i, &efds->sds);
+     
+      isset[0] = (rfds == NULL) ? 0 : FD_ISSET (i, &rfds->sds);
+      isset[1] = (wfds == NULL) ? 0 : FD_ISSET (i, &wfds->sds);
+      isset[2] = (efds == NULL) ? 0 : FD_ISSET (i, &efds->sds);
       if (!isset[0] && !isset[1] && !isset[2])
         continue;
       if (fd_counter >= allocated_nfds)