diff --git a/examples/overlay_editor/src/draw/path.rs b/examples/overlay_editor/src/draw/path.rs
index 9dbda54..b9384b0 100644
--- a/examples/overlay_editor/src/draw/path.rs
+++ b/examples/overlay_editor/src/draw/path.rs
@@ -94,7 +94,7 @@ impl PathWidget {
             FloatPoint::new(v.x, v.y)
         }).collect();
 
-        let sub_triangulation = stroke_builder.build_open_path_mesh::<FloatPoint<f32>, usize>(&screen_path);
+        let sub_triangulation = stroke_builder.build_open_path_mesh::<usize>(&screen_path);
         builder.append(sub_triangulation);
 
         let r2 = 2.0 * width;
@@ -111,7 +111,7 @@ impl PathWidget {
                 let v0 = m0 + t0;
                 let v1 = m0 + t1;
 
-                let arrow_triangulation = stroke_builder.build_open_path_mesh::<FloatPoint<f32>, usize>(&[v0, m, v1]);
+                let arrow_triangulation = stroke_builder.build_open_path_mesh::<usize>(&[v0, m, v1]);
                 builder.append(arrow_triangulation);
 
                 a = b;
diff --git a/examples/overlay_editor/src/draw/shape.rs b/examples/overlay_editor/src/draw/shape.rs
index 970a136..7e3ff3a 100644
--- a/examples/overlay_editor/src/draw/shape.rs
+++ b/examples/overlay_editor/src/draw/shape.rs
@@ -155,7 +155,7 @@ impl ShapeWidget {
                     .collect();
 
                 let sub_triangulation =
-                    stroke_builder.build_closed_path_mesh::<FloatPoint<f32>, usize>(&world_path);
+                    stroke_builder.build_closed_path_mesh::<usize>(&world_path);
                 builder.append(sub_triangulation);
             }
         }
@@ -192,7 +192,7 @@ impl ShapeWidget {
                 .collect();
 
             let sub_triangulation =
-                stroke_builder.build_closed_path_mesh::<FloatPoint<f32>, usize>(&world_path);
+                stroke_builder.build_closed_path_mesh::<usize>(&world_path);
             builder.append(sub_triangulation);
         }
 
diff --git a/examples/tests/outline/test_8.json b/examples/tests/outline/test_8.json
new file mode 100644
index 0000000..1ff8b01
--- /dev/null
+++ b/examples/tests/outline/test_8.json
@@ -0,0 +1,12 @@
+{
+  "scale": 100.0,
+  "outline": [
+    [
+        [53.0, 42.0],
+        [35.0, 66.0],
+        [26.0, 75.0],
+        [27.0, 74.0],
+        [53.0, 42.0]
+    ]
+  ]
+}
\ No newline at end of file
diff --git a/examples/tests/outline/test_9.json b/examples/tests/outline/test_9.json
new file mode 100644
index 0000000..534d4a5
--- /dev/null
+++ b/examples/tests/outline/test_9.json
@@ -0,0 +1,18 @@
+{
+  "scale": 100.0,
+  "outline": [
+    [
+      [0.0, 0.0],
+      [100.0, 0.0],
+      [100.0, 100.0],
+      [0.0, 100.0]
+    ],
+    [
+        [53.0, 42.0],
+        [27.0, 74.0],
+        [26.0, 75.0],
+        [35.0, 66.0],
+        [53.0, 42.0]
+    ]
+  ]
+}
\ No newline at end of file
diff --git a/iOverlay/Cargo.toml b/iOverlay/Cargo.toml
index 7018fe9..62ef955 100644
--- a/iOverlay/Cargo.toml
+++ b/iOverlay/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "i_overlay"
-version = "6.0.0"
+version = "6.0.1"
 authors = ["Nail Sharipov <nailxsharipov@gmail.com>"]
 edition = "2024"
 rust-version = "1.88"
diff --git a/iOverlay/src/mesh/outline/builder.rs b/iOverlay/src/mesh/outline/builder.rs
index 5dbe2a1..d5c16c8 100644
--- a/iOverlay/src/mesh/outline/builder.rs
+++ b/iOverlay/src/mesh/outline/builder.rs
@@ -159,8 +159,12 @@ impl<J: JoinBuilder<P>, P: FloatPointCompatible> Builder<J, P> {
         let vp = s0.b - s0.a;
 
         let cross = vi.cross_product(vp);
-        debug_assert!(cross != 0, "not possible! UniqueSegmentsIter guarantee it");
-        let outer_corner = (cross > 0) == self.extend;
+        let outer_corner = if cross != 0 {
+            (cross > 0) == self.extend
+        } else {
+            vi.dot_product(vp) < 0
+        };
+
         if outer_corner {
             if s0.b_top != s1.a_top {
                 self.join_builder.add_join(s0, s1, adapter, segments);
diff --git a/iOverlay/src/mesh/outline/offset.rs b/iOverlay/src/mesh/outline/offset.rs
index e8215e3..4937373 100644
--- a/iOverlay/src/mesh/outline/offset.rs
+++ b/iOverlay/src/mesh/outline/offset.rs
@@ -1220,6 +1220,24 @@ mod tests {
         };
     }
 
+    #[test]
+    fn test_real_case_1_offset() {
+        let contour = vec![
+            [53.0, 42.0],
+            [35.0, 66.0],
+            [26.0, 75.0],
+            [27.0, 74.0],
+            [53.0f64, 42.0],
+        ];
+
+        let style = OutlineStyle::new(1.0f64).line_join(LineJoin::Round(1.0f64));
+        contour.outline(&style);
+
+        if let Some(shape) = contour.outline(&style).first() {
+            assert!(shape[0].len() < 1_000);
+        };
+    }
+
     fn create_star(r0: f64, r1: f64, count: usize, angle: f64) -> Shape<[f64; 2]> {
         let da = core::f64::consts::PI / count as f64;
         let mut a = angle;