diff --git a/material_maker/graph_edit.gd b/material_maker/graph_edit.gd
index e1a78f1..728e5dd 100644
--- a/material_maker/graph_edit.gd
+++ b/material_maker/graph_edit.gd
@@ -190,11 +190,11 @@ func get_free_name(type) -> String:
 	return ""
 
 func create_nodes(data, position : Vector2 = Vector2(0, 0)) -> Array:
-	if data == null:
+	if !data is Dictionary:
 		return []
 	if data.has("type"):
 		data = { nodes=[data], connections=[] }
-	if typeof(data.nodes) == TYPE_ARRAY and typeof(data.connections) == TYPE_ARRAY:
+	if data.has("nodes") and typeof(data.nodes) == TYPE_ARRAY and data.has("connections") and typeof(data.connections) == TYPE_ARRAY:
 		var new_stuff = mm_loader.add_to_gen_graph(generator, data.nodes, data.connections)
 		for g in new_stuff.generators:
 			g.position += position
diff --git a/material_maker/graph_edit.tscn b/material_maker/graph_edit.tscn
index eaf6359..db7c975 100644
--- a/material_maker/graph_edit.tscn
+++ b/material_maker/graph_edit.tscn
@@ -80,10 +80,12 @@ hint_tooltip = "Show hierarchy"
 icon = SubResource( 4 )
 [connection signal="connection_request" from="." to="." method="connect_node"]
 [connection signal="connection_to_empty" from="." to="." method="request_popup"]
+[connection signal="copy_nodes_request" from="." to="." method="copy"]
 [connection signal="disconnection_request" from="." to="." method="disconnect_node"]
 [connection signal="duplicate_nodes_request" from="." to="." method="duplicate_selected"]
 [connection signal="gui_input" from="." to="." method="_on_GraphEdit_gui_input"]
 [connection signal="node_selected" from="." to="." method="_on_GraphEdit_node_selected"]
+[connection signal="paste_nodes_request" from="." to="." method="paste"]
 [connection signal="timeout" from="Timer" to="." method="do_send_changed_signal"]
 [connection signal="text_changed" from="GraphUI/SubGraphUI/Label" to="." method="_on_Label_text_changed"]
 [connection signal="toggled" from="GraphUI/SubGraphUI/ButtonTransmitsSeed" to="." method="_on_ButtonTransmitsSeed_toggled"]