diff --git a/interpolate_strokes/operators_velocity.py b/interpolate_strokes/operators_velocity.py
index a7ac4ba..af947e8 100644
--- a/interpolate_strokes/operators_velocity.py
+++ b/interpolate_strokes/operators_velocity.py
@@ -87,6 +87,10 @@ class GP_OT_interpolate_stroke_velocity(GP_OT_interpolate_stroke_base):
         if state := super().invoke(context, event):
             return state
 
+        if not self.settings.target_object and not self.settings.target_collection:
+            self.report({"ERROR"}, "No collection of object specified")
+            return {"CANCELLED"}
+        
         scn = bpy.context.scene
         settings = context.scene.gp_interpo_settings
 
diff --git a/interpolate_strokes/properties.py b/interpolate_strokes/properties.py
index 4e59e6e..84edf33 100644
--- a/interpolate_strokes/properties.py
+++ b/interpolate_strokes/properties.py
@@ -17,11 +17,11 @@ class GP_PG_interpolate_settings(PropertyGroup):
     method : EnumProperty(
         name='Method',
         items= (
-            ('GEOMETRY', 'Geometry', 'Directly follow underlying geometry', 0),
-            ('OBJECT', 'Object Geometry', 'Same as Geometry mode, but target only a specific object, even if occluded (ignore all the others)', 1),
-            ('BONE', 'Bone', 'Pick an armature bone and follow it', 2),
-            ('TRI', 'Triangle', 'Interpolate based on triangle traced manually over geometry', 3),
-            ('VELOCITY', 'Velocity', 'Interpolate based on velocity, works well for point outside geometry', 4)
+            ('VELOCITY', 'Velocity', 'Interpolate based on velocity, works well for point outside geometry', 0),
+            ('GEOMETRY', 'Geometry', 'Directly follow underlying geometry', 1),
+            ('OBJECT', 'Object Geometry', 'Same as Geometry mode, but target only a specific object, even if occluded (ignore all the others)', 2),
+            ('BONE', 'Bone', 'Pick an armature bone and follow it', 3),
+            ('TRI', 'Triangle', 'Interpolate based on triangle traced manually over geometry', 4)
         ),
         default='GEOMETRY',
         description='Select method for interpolating strokes'