diff --git a/OpenNest.Engine/CuttingPlanning/ContourEntryFeasibility.cs b/OpenNest.Engine/CuttingPlanning/ContourEntryFeasibility.cs
index ee88fd48..024782ee 100644
--- a/OpenNest.Engine/CuttingPlanning/ContourEntryFeasibility.cs
+++ b/OpenNest.Engine/CuttingPlanning/ContourEntryFeasibility.cs
@@ -90,7 +90,9 @@ public sealed class ContourEntryFeasibility
             return new(ContourFeasibilityStatus.Incomplete, "Foreign contour choice.");
         // A drawing pin's entry is a fixed emission, accepted as given: it is never filtered
         // out here. The emitted program's checks report its violations as warnings.
-        if (prepared.PinnedEntry(choice.ContourOrdinal) == choice)
+        // A forged ordinal falls through to the probe, which refuses it as Incomplete.
+        if (choice.ContourOrdinal >= 0 && choice.ContourOrdinal < prepared.Count
+            && prepared.PinnedEntry(choice.ContourOrdinal) == choice)
             return new(ContourFeasibilityStatus.Clear, null);
         var key = new Key(choice.ContourOrdinal, choice.EntityOrdinal,
             choice.Point.X, choice.Point.Y, nodeContext ?? string.Empty);
diff --git a/OpenNest.Tests/CuttingPlanning/ContourEntryFeasibilityTests.cs b/OpenNest.Tests/CuttingPlanning/ContourEntryFeasibilityTests.cs
index 9f432a4f..d5a97e01 100644
--- a/OpenNest.Tests/CuttingPlanning/ContourEntryFeasibilityTests.cs
+++ b/OpenNest.Tests/CuttingPlanning/ContourEntryFeasibilityTests.cs
@@ -176,12 +176,14 @@ public class ContourEntryFeasibilityTests
         var (other, _, _) = PreparedSquare();
         var forgedContour = choice with { Owner = other, ContourOrdinal = 99 };
         var forgedEntity = choice with { Owner = prepared, EntityOrdinal = 99 };
+        var forgedOwnedContour = choice with { Owner = prepared, ContourOrdinal = 99 };
         var feasibility = new ContourEntryFeasibility(prepared, At, own, []);
 
         var verdict = feasibility.Check(forgedContour);
         Assert.Equal(ContourFeasibilityStatus.Incomplete, verdict.Status);
         Assert.False(string.IsNullOrEmpty(verdict.Reason));
         Assert.Equal(ContourFeasibilityStatus.Incomplete, feasibility.Check(forgedEntity).Status);
+        Assert.Equal(ContourFeasibilityStatus.Incomplete, feasibility.Check(forgedOwnedContour).Status);
     }
 
     [Fact]