Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/SimpleFailureMechanismResultView.cs
===================================================================
diff -u -refa2c5f47b7da0400bc66295bcda54139b185f82 -ra0275c8e9e0a8c07ac4f118a9314352441e9e0d6
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/SimpleFailureMechanismResultView.cs	(.../SimpleFailureMechanismResultView.cs)	(revision efa2c5f47b7da0400bc66295bcda54139b185f82)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/SimpleFailureMechanismResultView.cs	(.../SimpleFailureMechanismResultView.cs)	(revision a0275c8e9e0a8c07ac4f118a9314352441e9e0d6)
@@ -20,7 +20,6 @@
 // All rights reserved.
 
 using System;
-using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Windows.Forms;
Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismResultView.cs
===================================================================
diff -u -refa2c5f47b7da0400bc66295bcda54139b185f82 -ra0275c8e9e0a8c07ac4f118a9314352441e9e0d6
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismResultView.cs	(.../PipingFailureMechanismResultView.cs)	(revision efa2c5f47b7da0400bc66295bcda54139b185f82)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismResultView.cs	(.../PipingFailureMechanismResultView.cs)	(revision a0275c8e9e0a8c07ac4f118a9314352441e9e0d6)
@@ -129,8 +129,13 @@
 
         private void ShowAssementLayerTwoAErrors(object sender, DataGridViewCellFormattingEventArgs e)
         {
+            if (e.ColumnIndex <= 0)
+            {
+                return;
+            }
+            
             var currentDataGridViewCell = DataGridViewControl.GetCell(e.RowIndex, e.ColumnIndex);
-
+            
             PipingFailureMechanismSectionResultRow resultRow = (PipingFailureMechanismSectionResultRow) GetDataAtRow(e.RowIndex);
 
             if (resultRow != null && e.ColumnIndex == assessmentLayerTwoAIndex)