diff --git a/core/nodeslicer/bpy_ns_types.py b/core/nodeslicer/bpy_ns_types.py
index 50fc7d2..ef31aa0 100644
--- a/core/nodeslicer/bpy_ns_types.py
+++ b/core/nodeslicer/bpy_ns_types.py
@@ -1,8 +1,6 @@
 import bpy
 from bpy.props import PointerProperty, StringProperty, FloatProperty, IntProperty, EnumProperty, BoolProperty, FloatVectorProperty, CollectionProperty
 
-from . import tree
-
 def notify_tree_changed(self, context):
     from . import tree
     if tree._is_updating:
diff --git a/core/nodeslicer/nodes/path.py b/core/nodeslicer/nodes/path.py
index cdc8c83..4622d0d 100644
--- a/core/nodeslicer/nodes/path.py
+++ b/core/nodeslicer/nodes/path.py
@@ -257,7 +257,7 @@ class SLICENODE_JoinSlices(SliceNodeJoiner):
     def evaluate_output(self, socket_name: str, **_kwargs) -> SlicePaths:
         from ....infra.blender.blender_slice_nodes_generic import resolve_input
         accumulated: SlicePaths = SlicePaths()
-        current: SlicePaths = SlicePaths()
+        current: SlicePaths | None = SlicePaths()
         for input in self.inputs:
             current = resolve_input(input)