make sure we test the reply to be not NULL too.

diff --git a/spectrwm.c b/spectrwm.c
index b36aee19ee0d44853c7cf5e0a5851d4adfbb9a7b..e5a8a02d8a885e8bb4f49f393336059d7b771711 100644 (file)
--- a/spectrwm.c
+++ b/spectrwm.c
@@ -841,7 +841,7 @@ teardown_ewmh(void)
                pc = xcb_get_property(conn, 0, screens[i].root, sup_check,
                    XCB_ATOM_WINDOW, 0, 1);
                pr = xcb_get_property_reply(conn, pc, NULL);
-               if (pr->format == sup_check) {
+               if (pr && pr->format == sup_check) {
                        id = *((xcb_window_t *)xcb_get_property_value(pr));
 
                        xcb_destroy_window(conn, id);
@@ -6443,7 +6443,7 @@ get_ws_idx(xcb_window_t id)
                xcb_get_property(conn, 0, id, a_swm_ws,
                    XCB_ATOM_STRING, 0, SWM_PROPLEN),
                NULL);
-       if (gpr->type) {
+       if (gpr && gpr->type) {
                proplen = xcb_get_property_value_length(gpr);
                if (proplen > 0) {
                        prop = malloc(proplen + 1);