From 0042fb352b915e6f196a4eaf13d2659725ca4756 Mon Sep 17 00:00:00 2001
From: kruland2607 <kruland2607@github.com>
Date: Thu, 22 May 2014 13:44:44 -0500
Subject: [PATCH] Protect the table header when the pointer is outside.

---
 swing/src/net/sf/openrocket/gui/adaptors/ColumnTable.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/swing/src/net/sf/openrocket/gui/adaptors/ColumnTable.java b/swing/src/net/sf/openrocket/gui/adaptors/ColumnTable.java
index a1c54c2f7..f0e937345 100644
--- a/swing/src/net/sf/openrocket/gui/adaptors/ColumnTable.java
+++ b/swing/src/net/sf/openrocket/gui/adaptors/ColumnTable.java
@@ -18,6 +18,9 @@ public class ColumnTable extends JTable {
 				String tip = null;
 				java.awt.Point p = e.getPoint();
 				int index = columnModel.getColumnIndexAtX(p.x);
+				if ( index < 0 ) {
+					return null;
+				}
 				int realIndex = columnModel.getColumn(index).getModelIndex();
 				tip = ((ColumnTableModel) getModel()).getColumn(realIndex).getToolTip();
 				return tip;