diff --git a/blackboard/blackboard_plan.cpp b/blackboard/blackboard_plan.cpp
index 5873bb0..b49b4e0 100644
--- a/blackboard/blackboard_plan.cpp
+++ b/blackboard/blackboard_plan.cpp
@@ -434,7 +434,7 @@ void BlackboardPlan::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("sync_with_base_plan"), &BlackboardPlan::sync_with_base_plan);
 	ClassDB::bind_method(D_METHOD("set_parent_scope_plan_provider", "callable"), &BlackboardPlan::set_parent_scope_plan_provider);
 	ClassDB::bind_method(D_METHOD("get_parent_scope_plan_provider"), &BlackboardPlan::get_parent_scope_plan_provider);
-	ClassDB::bind_method(D_METHOD("create_blackboard", "node", "parent_scope"), &BlackboardPlan::create_blackboard);
+	ClassDB::bind_method(D_METHOD("create_blackboard", "node", "parent_scope"), &BlackboardPlan::create_blackboard, DEFVAL(Ref<Blackboard>()));
 	ClassDB::bind_method(D_METHOD("populate_blackboard", "blackboard", "overwrite", "node"), &BlackboardPlan::populate_blackboard);
 
 	// To avoid cluttering the member namespace, we do not export unnecessary properties in this class.
diff --git a/doc/source/classes/class_blackboardplan.rst b/doc/source/classes/class_blackboardplan.rst
index 88b2ba3..cb66121 100644
--- a/doc/source/classes/class_blackboardplan.rst
+++ b/doc/source/classes/class_blackboardplan.rst
@@ -35,7 +35,7 @@ Methods
    :widths: auto
 
    +---------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-   | :ref:`Blackboard<class_Blackboard>`         | :ref:`create_blackboard<class_BlackboardPlan_method_create_blackboard>` **(** Node node, :ref:`Blackboard<class_Blackboard>` parent_scope **)**                   |
+   | :ref:`Blackboard<class_Blackboard>`         | :ref:`create_blackboard<class_BlackboardPlan_method_create_blackboard>` **(** Node node, :ref:`Blackboard<class_Blackboard>` parent_scope=null **)**              |
    +---------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
    | :ref:`BlackboardPlan<class_BlackboardPlan>` | :ref:`get_base_plan<class_BlackboardPlan_method_get_base_plan>` **(** **)** |const|                                                                               |
    +---------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
@@ -87,7 +87,7 @@ Method Descriptions
 
 .. rst-class:: classref-method
 
-:ref:`Blackboard<class_Blackboard>` **create_blackboard** **(** Node node, :ref:`Blackboard<class_Blackboard>` parent_scope **)**
+:ref:`Blackboard<class_Blackboard>` **create_blackboard** **(** Node node, :ref:`Blackboard<class_Blackboard>` parent_scope=null **)**
 
 Constructs a new instance of a :ref:`Blackboard<class_Blackboard>` using this plan. If ``NodePath`` prefetching is enabled, ``node`` will be used to retrieve node instances for ``NodePath`` variables and substitute their values.
 
diff --git a/doc_classes/BlackboardPlan.xml b/doc_classes/BlackboardPlan.xml
index 5e3fe24..80de4d5 100644
--- a/doc_classes/BlackboardPlan.xml
+++ b/doc_classes/BlackboardPlan.xml
@@ -11,7 +11,7 @@
 		<method name="create_blackboard">
 			<return type="Blackboard" />
 			<param index="0" name="node" type="Node" />
-			<param index="1" name="parent_scope" type="Blackboard" />
+			<param index="1" name="parent_scope" type="Blackboard" default="null" />
 			<description>
 				Constructs a new instance of a [Blackboard] using this plan. If [NodePath] prefetching is enabled, [param node] will be used to retrieve node instances for [NodePath] variables and substitute their values.
 			</description>