diff --git a/blackboard/blackboard_plan.cpp b/blackboard/blackboard_plan.cpp
index a430187..4545a6b 100644
--- a/blackboard/blackboard_plan.cpp
+++ b/blackboard/blackboard_plan.cpp
@@ -121,7 +121,11 @@ bool BlackboardPlan::_property_get_revert(const StringName &p_name, Variant &r_p
 }
 
 void BlackboardPlan::set_base_plan(const Ref<BlackboardPlan> &p_base) {
-	base = p_base;
+	if (p_base == this) {
+		base.unref();
+	} else {
+		base = p_base;
+	}
 	sync_with_base_plan();
 	notify_property_list_changed();
 }