Index: trunk/src_plugins/lib_hid_pcbui/layer_menu.c
===================================================================
--- trunk/src_plugins/lib_hid_pcbui/layer_menu.c	(revision 29913)
+++ trunk/src_plugins/lib_hid_pcbui/layer_menu.c	(revision 29914)
@@ -243,6 +243,9 @@
 {
 	pcb_hidval_t timerdata;
 
+	if ((pcb_gui == NULL) || (!pcb_gui->gui))
+		return;
+
 	if (layer_menu_install_timer_active) {
 		pcb_gui->stop_timer(pcb_gui, layer_menu_install_timer);
 		layer_menu_install_timer_active = 0;
@@ -285,6 +288,9 @@
 
 /*	pcb_trace("************ layer key update ev!\n");*/
 
+	if ((pcb_gui == NULL) || (!pcb_gui->gui))
+		return;
+
 	if (layer_menu_key_timer_active) {
 		pcb_gui->stop_timer(pcb_gui, layer_menu_key_timer);
 		layer_menu_key_timer_active = 0;