diff --git a/wgp.py b/wgp.py
index c57cc48..653683c 100644
--- a/wgp.py
+++ b/wgp.py
@@ -7478,7 +7478,7 @@ def generate_video_tab(update_form = False, state_dict = None, ui_defaults = Non
                     
                     current_video_length = ui_defaults.get("video_length", 81 if get_model_family(base_model_type)=="wan" else 97)
 
-                    computed_fps = get_computed_fps(ui_defaults.get("force_fps",""), base_model_type , video_guide, video_source )
+                    computed_fps = get_computed_fps(ui_defaults.get("force_fps",""), base_model_type , ui_defaults.get("video_guide", None), ui_defaults.get("video_source", None))
                     video_length = gr.Slider(min_frames, get_max_frames(737 if test_any_sliding_window(base_model_type) else 337), value=current_video_length, 
                          step=frames_step, label=compute_video_length_label(computed_fps, current_video_length) , visible = True, interactive= True)