diff --git a/roop/core.py b/roop/core.py
index 23a0883d6..5f4a32dfb 100755
--- a/roop/core.py
+++ b/roop/core.py
@@ -57,8 +57,8 @@ def parse_args() -> None:
 
     roop.globals.source_path = args.source_path
     roop.globals.target_path = args.target_path
-    roop.globals.output_path = normalize_output_path(roop.globals.source_path, roop.globals.target_path, args.output_path)  # type: ignore
-    roop.globals.headless = roop.globals.source_path and roop.globals.target_path and roop.globals.output_path
+    roop.globals.output_path = normalize_output_path(roop.globals.source_path, roop.globals.target_path, args.output_path)
+    roop.globals.headless = roop.globals.source_path is None and roop.globals.target_path is None and roop.globals.output_path is None
     roop.globals.frame_processors = args.frame_processor
     roop.globals.keep_fps = args.keep_fps
     roop.globals.keep_frames = args.keep_frames
diff --git a/roop/globals.py b/roop/globals.py
index f7c68e650..3eca8d0d0 100644
--- a/roop/globals.py
+++ b/roop/globals.py
@@ -1,22 +1,22 @@
-from typing import List
+from typing import List, Optional
 
-source_path = None
-target_path = None
-output_path = None
-headless = None
+source_path: Optional[str] = None
+target_path: Optional[str] = None
+output_path: Optional[str] = None
+headless: Optional[bool] = None
 frame_processors: List[str] = []
-keep_fps = None
-keep_frames = None
-skip_audio = None
-many_faces = None
-reference_face_position = None
-reference_frame_number = None
-similar_face_distance = None
-temp_frame_format = None
-temp_frame_quality = None
-output_video_encoder = None
-output_video_quality = None
-max_memory = None
+keep_fps: Optional[bool] = None
+keep_frames: Optional[bool] = None
+skip_audio: Optional[bool] = None
+many_faces: Optional[bool] = None
+reference_face_position: Optional[int] = None
+reference_frame_number: Optional[int] = None
+similar_face_distance: Optional[float] = None
+temp_frame_format: Optional[str] = None
+temp_frame_quality: Optional[int] = None
+output_video_encoder: Optional[str] = None
+output_video_quality: Optional[int] = None
+max_memory: Optional[int] = None
 execution_providers: List[str] = []
-execution_threads = None
-log_level = 'error'
+execution_threads: Optional[int] = None
+log_level: str = 'error'
diff --git a/roop/processors/frame/face_swapper.py b/roop/processors/frame/face_swapper.py
index 7824d9cf0..b8072076f 100644
--- a/roop/processors/frame/face_swapper.py
+++ b/roop/processors/frame/face_swapper.py
@@ -75,10 +75,7 @@ def process_frame(source_face: Face, reference_face: Face, temp_frame: Frame) ->
 
 def process_frames(source_path: str, temp_frame_paths: List[str], update: Callable[[], None]) -> None:
     source_face = get_one_face(cv2.imread(source_path))
-    if roop.globals.many_faces:
-        reference_face = None
-    else:
-        reference_face = get_face_reference()
+    reference_face = None if roop.globals.many_faces else get_face_reference()
     for temp_frame_path in temp_frame_paths:
         temp_frame = cv2.imread(temp_frame_path)
         result = process_frame(source_face, reference_face, temp_frame)
@@ -90,10 +87,7 @@ def process_frames(source_path: str, temp_frame_paths: List[str], update: Callab
 def process_image(source_path: str, target_path: str, output_path: str) -> None:
     source_face = get_one_face(cv2.imread(source_path))
     target_frame = cv2.imread(target_path)
-    if roop.globals.many_faces:
-        reference_face = None
-    else:
-        reference_face = get_one_face(target_frame, roop.globals.reference_face_position)
+    reference_face = None if roop.globals.many_faces else get_one_face(target_frame, roop.globals.reference_face_position)
     result = process_frame(source_face, reference_face, target_frame)
     cv2.imwrite(output_path, result)
 
diff --git a/roop/ui.py b/roop/ui.py
index 67ec32a52..cebe6a20c 100644
--- a/roop/ui.py
+++ b/roop/ui.py
@@ -152,7 +152,7 @@ def select_source_path(source_path: Optional[str] = None) -> None:
     if source_path is None:
         source_path = ctk.filedialog.askopenfilename(title='select an source image', initialdir=RECENT_DIRECTORY_SOURCE)
     if is_image(source_path):
-        roop.globals.source_path = source_path  # type: ignore
+        roop.globals.source_path = source_path
         RECENT_DIRECTORY_SOURCE = os.path.dirname(roop.globals.source_path)
         image = render_image_preview(roop.globals.source_path, (200, 200))
         source_label.configure(image=image)
@@ -170,12 +170,12 @@ def select_target_path(target_path: Optional[str] = None) -> None:
     if target_path is None:
         target_path = ctk.filedialog.askopenfilename(title='select an target image or video', initialdir=RECENT_DIRECTORY_TARGET)
     if is_image(target_path):
-        roop.globals.target_path = target_path  # type: ignore
+        roop.globals.target_path = target_path
         RECENT_DIRECTORY_TARGET = os.path.dirname(roop.globals.target_path)
         image = render_image_preview(roop.globals.target_path, (200, 200))
         target_label.configure(image=image)
     elif is_video(target_path):
-        roop.globals.target_path = target_path  # type: ignore
+        roop.globals.target_path = target_path
         RECENT_DIRECTORY_TARGET = os.path.dirname(roop.globals.target_path)
         video_frame = render_video_preview(target_path, (200, 200))
         target_label.configure(image=video_frame)
@@ -273,8 +273,8 @@ def update_preview(frame_number: int = 0) -> None:
 
 def update_face_reference(steps: int) -> None:
     clear_face_reference()
-    reference_frame_number = preview_slider.get()
-    roop.globals.reference_face_position += steps  # type: ignore
+    reference_frame_number = int(preview_slider.get())
+    roop.globals.reference_face_position += steps
     roop.globals.reference_frame_number = reference_frame_number
     update_preview(reference_frame_number)