diff --git a/operators/casting.py b/operators/casting.py
index 4f322c2..6cd68e5 100644
--- a/operators/casting.py
+++ b/operators/casting.py
@@ -87,7 +87,7 @@ class VSETB_OT_casting_add(Operator):
     #asset_name : EnumProperty(name='', items=get_scene_settings().active_project.get('asset_items', []))
     @classmethod
     def poll(cls, context):
-        active_strip = context.scene.sequence_editor.active_strip
+        active_strip = context.active_sequence_strip
         if active_strip:
             return True
 
@@ -135,7 +135,7 @@ class VSETB_OT_casting_remove(Operator):
 
     @classmethod
     def poll(cls, context):
-        active_strip = context.scene.sequence_editor.active_strip
+        active_strip = context.active_sequence_strip
         if active_strip:
             return True
 
@@ -190,7 +190,7 @@ class VSETB_OT_casting_move(Operator):
 
     @classmethod
     def poll(cls, context):
-        active_strip = context.scene.sequence_editor.active_strip
+        active_strip = context.active_sequence_strip
         if active_strip:
             return True
 
@@ -229,16 +229,15 @@ class VSETB_OT_copy_casting(Operator):
 
     @classmethod
     def poll(cls, context):
-        active_strip = context.scene.sequence_editor.active_strip
+        if not context.scene.sequence_editor:
+            return
+        active_strip = context.active_sequence_strip
         strip_settings = get_strip_settings()
         
         if active_strip and strip_settings.casting:
             return True
 
     def execute(self, context):
-        scn = context.scene
-        
-        active_strip = scn.sequence_editor.active_strip
         strip_settings = get_strip_settings()
         
         datas = [c.to_dict() for c in strip_settings.casting]
@@ -257,9 +256,7 @@ class VSETB_OT_paste_casting(Operator):
 
     @classmethod
     def poll(cls, context):
-        active_strip = context.scene.sequence_editor.active_strip
-        if active_strip:
-            return True
+        return context.active_sequence_strip
 
     def invoke(self, context, event):
         self.mode = 'REPLACE'
diff --git a/operators/sequencer.py b/operators/sequencer.py
index 2b36492..c4c2c2f 100644
--- a/operators/sequencer.py
+++ b/operators/sequencer.py
@@ -427,7 +427,7 @@ class VSETB_OT_next_shot(Operator):
         
         bpy.ops.sequencer.select_all(action="DESELECT")
         next_shot.select = True
-        context.scene.sequence_editor.active_strip = next_shot
+        context.active_sequence_strip = next_shot
 
         return {"FINISHED"}