diff --git a/pcbnew/dialogs/dialog_net_inspector.cpp b/pcbnew/dialogs/dialog_net_inspector.cpp
index 8712ecda94..b9715b5df6 100644
--- a/pcbnew/dialogs/dialog_net_inspector.cpp
+++ b/pcbnew/dialogs/dialog_net_inspector.cpp
@@ -871,6 +871,7 @@ protected:
             return compareUInt( i1.GetTotalLength(), i2.GetTotalLength(), aAsc );
 
         else if( aCol > COLUMN_NUM_STATIC_COL
+                && aCol < m_parent.m_columns.size()
                 && i1.GetLayerWireLength( m_parent.m_columns[aCol].layer )
                         != i2.GetLayerWireLength( m_parent.m_columns[aCol].layer ) )
         {