object_print3d_utils/operators.py

@@ -706,6 +706,11 @@ class MESH_OT_print3d_scale_to_bounds(Operator):
         def calc_length(vecs):
             return max(((max(v[i] for v in vecs) - min(v[i] for v in vecs)), i) for i in range(3))
 
+        #Make sure at least one object is selected 
+        if not context.selected_objects:
+            self.report({'ERROR'}, "No objects selected")
+            return {'CANCELLED'}
+        
         if context.mode == 'EDIT_MESH':
             length, axis = calc_length(
                 [Vector(v) @ obj.matrix_world for obj in [context.edit_object] for v in obj.bound_box]