diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64fad71f..49e3bf9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ CHANGELOG for FlatCAM beta
 
 - fixed the Cutout plugin not working with Geometry objects that are made out of a LineString or LinearRing geometric elements
 - fixed the Cutout plugin for the rectangular cutout: the name of the resulting object is now correct if there is no extension in the source file
+- modified the bounding box utility feature in the Gerber Object UI to work with buffer value of 0.0 and rounded corners
 
 25.01.2022
 
diff --git a/appObjects/FlatCAMGerber.py b/appObjects/FlatCAMGerber.py
index 6bf7b686..a2ed9b6a 100644
--- a/appObjects/FlatCAMGerber.py
+++ b/appObjects/FlatCAMGerber.py
@@ -461,7 +461,7 @@ class GerberObject(FlatCAMObj, Gerber):
             non_copper = bounding_box.difference(self.solid_geometry)
             non_copper = flatten_shapely_geometry(non_copper)
 
-            if non_copper is None or non_copper.is_empty:
+            if non_copper is None or (not isinstance(non_copper, list) and non_copper.is_empty):
                 app_obj.inform.emit("[ERROR_NOTCL] %s" % _("Operation could not be done."))
                 return "fail"
             geo_obj.solid_geometry = non_copper
@@ -483,7 +483,15 @@ class GerberObject(FlatCAMObj, Gerber):
                     self.solid_geometry = unary_union(self.solid_geometry)
 
             # Bounding box with rounded corners
-            bounding_box = self.solid_geometry.envelope.buffer(float(self.options["bboxmargin"]))
+            if isinstance(self.solid_geometry, Polygon):
+                bounding_box = self.solid_geometry.buffer(float(self.options["bboxmargin"])).exterior
+            elif isinstance(self.solid_geometry, MultiPolygon):
+                try:
+                    bounding_box = self.solid_geometry.buffer(float(self.options["bboxmargin"])).exterior
+                except Exception:
+                    bounding_box = self.solid_geometry.envelope.buffer(float(self.options["bboxmargin"]))
+            else:
+                bounding_box = self.solid_geometry.envelope.buffer(float(self.options["bboxmargin"]))
             if not self.options["bboxrounded"]:  # Remove rounded corners
                 bounding_box = bounding_box.envelope
 
diff --git a/appParsers/ParseGerber.py b/appParsers/ParseGerber.py
index 433c70eb..3e11b15a 100644
--- a/appParsers/ParseGerber.py
+++ b/appParsers/ParseGerber.py
@@ -2506,7 +2506,10 @@ class Gerber(Geometry):
         # variables to display the percentage of work done
         self.geo_len = 0
         try:
-            self.geo_len = len(self.solid_geometry)
+            if isinstance(self.solid_geometry, (MultiPolygon, MultiLineString)):
+                self.geo_len = len(self.solid_geometry.geoms)
+            else:
+                self.geo_len = len(self.solid_geometry)
         except (TypeError, ValueError, RuntimeError):
             self.geo_len = 1