diff --git a/src/autorouter/autorouter.rs b/src/autorouter/autorouter.rs
index 20bf559..60e8347 100644
--- a/src/autorouter/autorouter.rs
+++ b/src/autorouter/autorouter.rs
@@ -23,6 +23,7 @@ use crate::{
     drawing::{
         dot::FixedDotIndex,
         graph::{GetLayer, GetMaybeNet},
+        Infringement,
     },
     layout::{via::ViaWeight, Layout},
     math::Circle,
@@ -41,6 +42,8 @@ pub enum AutorouterError {
     Navmesh(#[from] NavmeshError),
     #[error(transparent)]
     Router(#[from] RouterError),
+    #[error("could not place via")]
+    CouldNotPlaceVia(#[from] Infringement),
 }
 
 pub enum AutorouterStatus {
@@ -96,7 +99,7 @@ impl<M: MesadataTrait> Autorouter<M> {
     }
 
     pub fn place_via(&mut self, weight: ViaWeight) -> Result<(), AutorouterError> {
-        self.board.layout_mut().add_via(weight);
+        self.board.layout_mut().add_via(weight)?;
         Ok(())
     }
 
diff --git a/src/bin/topola-egui/app.rs b/src/bin/topola-egui/app.rs
index 4359703..c2ffcf8 100644
--- a/src/bin/topola-egui/app.rs
+++ b/src/bin/topola-egui/app.rs
@@ -383,9 +383,9 @@ impl eframe::App for App {
                                             to_layer: 0,
                                             circle: Circle {
                                                 pos: point! {x: latest_pos.x as f64, y: -latest_pos.y as f64},
-                                                r: 100.0,
+                                                r: 10000.0,
                                             },
-                                            maybe_net: None,
+                                            maybe_net: Some(1234),
                                         }),
                                         &mut EmptyRouterObserver,
                                     );
diff --git a/src/drawing/drawing.rs b/src/drawing/drawing.rs
index fed8075..cedc195 100644
--- a/src/drawing/drawing.rs
+++ b/src/drawing/drawing.rs
@@ -780,6 +780,7 @@ impl<CW: Copy, R: RulesTrait> Drawing<CW, R> {
                 &limiting_shape.envelope_3d(0.0, node.primitive(self).layer()),
             )
             .filter_map(|wrapper| {
+                dbg!("a");
                 if let GenericNode::Primitive(primitive_node) = wrapper.data {
                     Some(primitive_node)
                 } else {
@@ -787,19 +788,21 @@ impl<CW: Copy, R: RulesTrait> Drawing<CW, R> {
                 }
             })
             .filter(|primitive_node| {
+                dbg!("b");
                 maybe_except.is_some_and(|except| !except.contains(&primitive_node))
             })
-            .filter(|primitive_node| !self.are_connectable(node, *primitive_node))
+            .filter(|primitive_node| dbg!(!self.are_connectable(node, *primitive_node)))
             .filter(|primitive_node| {
+                dbg!(node, primitive_node);
                 let infringee_conditions = primitive_node.primitive(self).conditions();
 
                 let epsilon = 1.0;
-                inflated_shape = node.primitive(self).shape().inflate(
+                inflated_shape = dbg!(node.primitive(self).shape().inflate(
                     (self.rules.clearance(&conditions, &infringee_conditions) - epsilon)
                         .clamp(0.0, f64::INFINITY),
-                );
+                ));
 
-                inflated_shape.intersects(&primitive_node.primitive(self).shape())
+                dbg!(inflated_shape.intersects(&dbg!(primitive_node.primitive(self).shape())))
             })
             .map(|primitive_node| primitive_node)
             .next()
diff --git a/tests/single_layer.rs b/tests/single_layer.rs
index dd75dcf..126b4a6 100644
--- a/tests/single_layer.rs
+++ b/tests/single_layer.rs
@@ -5,14 +5,19 @@ use petgraph::{
     visit::{EdgeRef, IntoEdgeReferences, NodeIndexable},
 };
 use topola::{
-    autorouter::{invoker::Invoker, Autorouter},
+    autorouter::{
+        invoker::{Command, Invoker, InvokerError},
+        Autorouter, AutorouterError,
+    },
     drawing::{
         graph::{GetLayer, GetMaybeNet},
         primitive::GetInnerOuter,
     },
     dsn::design::DsnDesign,
     graph::GetNodeIndex,
-    layout::NodeIndex,
+    layout::{via::ViaWeight, NodeIndex},
+    math::Circle,
+    router::EmptyRouterObserver,
     triangulation::GetTrianvertexIndex,
 };
 
@@ -48,6 +53,27 @@ fn test_tht_diode_bridge_rectifier() {
     common::assert_single_layer_groundless_autoroute(&mut autorouter, "F.Cu");
     //common::assert_number_of_conncomps(&mut autorouter, 4);
     common::assert_band_length(autorouter.board(), "J2-2", "D4-2", 15500.0, 0.5);
+
+    let mut invoker = Invoker::new(autorouter);
+    let result = invoker.execute(
+        Command::PlaceVia(ViaWeight {
+            from_layer: 0,
+            to_layer: 1,
+            circle: Circle {
+                pos: [0.0, 0.0].into(),
+                r: 200000.0,
+            },
+            maybe_net: Some(1234),
+        }),
+        &mut EmptyRouterObserver,
+    );
+    let result = dbg!(result);
+    assert!(matches!(
+        result,
+        Err(InvokerError::Autorouter(AutorouterError::CouldNotPlaceVia(
+            ..
+        )))
+    ));
 }
 
 #[test]