diff --git a/laserstudio/widgets/marker.py b/laserstudio/widgets/marker.py
index 7d107b7..fa6a1da 100644
--- a/laserstudio/widgets/marker.py
+++ b/laserstudio/widgets/marker.py
@@ -95,7 +95,7 @@ def color(self, value: Union[QColor, Qt.GlobalColor, int]):
     def qfillcolor(self) -> QColor:
         """:return: Current fill color, as QColor."""
         return QColor(self.__fillcolor)
-    
+
     @property
     def fillcolor(self):
         """:return: Current fill color, as QColor."""
@@ -138,8 +138,8 @@ def update_pos(self):
         else:
             self.setVisible(False)
 
-    def setToolTip(self, value: str):
-        self.__ellipse.setToolTip(value)
+    def setToolTip(self, toolTip: Optional[str]):
+        self.__ellipse.setToolTip(toolTip)
 
 
 class IdMarker(Marker):
diff --git a/laserstudio/widgets/scangeometry.py b/laserstudio/widgets/scangeometry.py
index 55a6094..b290343 100644
--- a/laserstudio/widgets/scangeometry.py
+++ b/laserstudio/widgets/scangeometry.py
@@ -74,9 +74,14 @@ def __update(self):
             )
         else:
             for poly in self.__scan_geometry.geoms:
-                self.__scan_zones_group.addToGroup(
-                    ScanGeometry.__poly_to_path_item(poly)
-                )
+                if isinstance(poly, Polygon):
+                    self.__scan_zones_group.addToGroup(
+                        ScanGeometry.__poly_to_path_item(poly)
+                    )
+                else:
+                    logging.getLogger("laserstudio").error(
+                        "Unsupported geometry type in scan geometry."
+                    )
         self.addToGroup(self.__scan_zones_group)
 
         # Also, update the scan path with the new geometry
@@ -146,7 +151,7 @@ def density(self, value: int):
 
     @staticmethod
     def shapely_to_yaml(
-        geometry: Union[Polygon, MultiPolygon, GeometryCollection]
+        geometry: Union[Polygon, MultiPolygon, GeometryCollection],
     ) -> dict:
         """
         :return: A dict for YAML serialization.
diff --git a/laserstudio/widgets/toolbars/markerstoolbar.py b/laserstudio/widgets/toolbars/markerstoolbar.py
index 180eabe..e95fe7f 100644
--- a/laserstudio/widgets/toolbars/markerstoolbar.py
+++ b/laserstudio/widgets/toolbars/markerstoolbar.py
@@ -1,6 +1,6 @@
 from PyQt6.QtCore import Qt, QSize
 from PyQt6.QtGui import QIcon
-from PyQt6.QtWidgets import QToolBar, QPushButton, QMainWindow
+from PyQt6.QtWidgets import QToolBar, QPushButton
 from ..return_line_edit import ReturnSpinBox
 from ...utils.util import colored_image
 from ..viewer import Viewer