diff --git a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody2DAgent.gd b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody2DAgent.gd
index 18f8a11..c422e8f 100644
--- a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody2DAgent.gd
+++ b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody2DAgent.gd
@@ -49,6 +49,9 @@ func _apply_sliding_steering(accel: Vector3, delta: float) -> void:
 	var _body: KinematicBody2D = _body_ref.get_ref()
 	if not _body:
 		return
+
+	if not _body.is_inside_tree():
+		return
 		
 	var velocity := GSAIUtils.to_vector2(linear_velocity + accel * delta).clamped(linear_speed_max)
 	if apply_linear_drag:
diff --git a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody3DAgent.gd b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody3DAgent.gd
index 89bb5a3..ddc556b 100644
--- a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody3DAgent.gd
+++ b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIKinematicBody3DAgent.gd
@@ -132,6 +132,9 @@ func _on_SceneTree_physics_frame() -> void:
 	if not _body:
 		return
 
+	if not _body.is_inside_tree():
+		return
+
 	var current_position := _body.transform.origin
 	var current_orientation := _body.rotation.y
 
diff --git a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody2DAgent.gd b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody2DAgent.gd
index 71ecd54..763ae65 100644
--- a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody2DAgent.gd
+++ b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody2DAgent.gd
@@ -50,6 +50,9 @@ func _on_SceneTree_frame() -> void:
 	var _body: RigidBody2D = _body_ref.get_ref()
 	if not _body:
 		return
+	
+	if not _body.is_inside_tree():
+		return
 
 	var current_position := _body.global_position
 	var current_orientation := _body.rotation
diff --git a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody3DAgent.gd b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody3DAgent.gd
index ad8e52b..bc26959 100644
--- a/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody3DAgent.gd
+++ b/godot/addons/com.gdquest.godot-steering-ai-framework/Agents/GSAIRigidBody3DAgent.gd
@@ -49,6 +49,9 @@ func _on_SceneTree_frame() -> void:
 	var _body: RigidBody = _body_ref.get_ref()
 	if not _body:
 		return
+	
+	if not _body.is_inside_tree():
+		return
 		
 	var current_position := _body.transform.origin
 	var current_orientation := _body.rotation.y