diff --git a/roop/core.py b/roop/core.py
index 608a075c4..32665f71a 100755
--- a/roop/core.py
+++ b/roop/core.py
@@ -20,7 +20,7 @@
 import roop.globals
 import roop.metadata
 import roop.ui as ui
-from roop.predicter import predict_image, predict_video
+from roop.predictor import predict_image, predict_video
 from roop.processors.frame.core import get_frame_processors_modules
 from roop.utilities import has_image_extension, is_image, is_video, detect_fps, create_video, extract_frames, get_temp_frame_paths, restore_audio, create_temp, move_temp, clean_temp, normalize_output_path
 
diff --git a/roop/predicter.py b/roop/predictor.py
similarity index 80%
rename from roop/predicter.py
rename to roop/predictor.py
index 7ebc2b62e..4b1ace20d 100644
--- a/roop/predicter.py
+++ b/roop/predictor.py
@@ -1,18 +1,24 @@
+import threading
 import numpy
 import opennsfw2
 from PIL import Image
+from keras import Model
 
 from roop.typing import Frame
 
 MAX_PROBABILITY = 0.85
 
+def clear_predictor() -> None:
+    global PREDICTOR
+
+    PREDICTOR = None
+
 
 def predict_frame(target_frame: Frame) -> bool:
     image = Image.fromarray(target_frame)
     image = opennsfw2.preprocess_image(image, opennsfw2.Preprocessing.YAHOO)
-    model = opennsfw2.make_open_nsfw_model()
     views = numpy.expand_dims(image, axis=0)
-    _, probability = model.predict(views)[0]
+    _, probability = get_predictor().predict(views)[0]
     return probability > MAX_PROBABILITY
 
 
diff --git a/roop/ui.py b/roop/ui.py
index f54426870..8ad11382a 100644
--- a/roop/ui.py
+++ b/roop/ui.py
@@ -11,7 +11,7 @@
 from roop.face_analyser import get_one_face
 from roop.capturer import get_video_frame, get_video_frame_total
 from roop.face_reference import get_face_reference, set_face_reference, clear_face_reference
-from roop.predicter import predict_frame
+from roop.predictor import predict_frame, clear_predictor
 from roop.processors.frame.core import get_frame_processors_modules
 from roop.utilities import is_image, is_video, resolve_relative_path
 
@@ -212,6 +212,7 @@ def render_video_preview(video_path: str, size: Tuple[int, int], frame_number: i
 def toggle_preview() -> None:
     if PREVIEW.state() == 'normal':
         PREVIEW.withdraw()
+        clear_predictor()
     elif roop.globals.source_path and roop.globals.target_path:
         init_preview()
         update_preview(roop.globals.reference_frame_number)
@@ -252,12 +253,10 @@ def update_preview(frame_number: int = 0) -> None:
         preview_label.configure(image=image)
 
 
-def update_face_reference(delta: int) -> None:
-    global preview_slider
-
+def update_face_reference(step: int) -> None:
     clear_face_reference()
     reference_frame_number = preview_slider.get()
-    roop.globals.reference_face_position += delta  # type: ignore
+    roop.globals.reference_face_position += step  # type: ignore
     roop.globals.reference_frame_number = reference_frame_number
     update_preview(reference_frame_number)