diff --git a/tinySAK/src/tsk_fsm.c b/tinySAK/src/tsk_fsm.c
index e64a1ae0..e988a8e1 100755
--- a/tinySAK/src/tsk_fsm.c
+++ b/tinySAK/src/tsk_fsm.c
@@ -145,7 +145,7 @@ int tsk_fsm_act(tsk_fsm_t* self, tsk_fsm_action_id action, const void* cond_data
 
     va_start(ap, cond_data2);
     tsk_list_foreach(item, self->entries) {
-		if (!item) {
+		if (!item || !item->data) {
 			continue;
 		}
         tsk_fsm_entry_t* entry = (tsk_fsm_entry_t*)item->data;