From a3e7e0f868ce9911e1b0140bfef1ca2bc662f1e6 Mon Sep 17 00:00:00 2001
From: amwaterhouse <Andrew Waterhouse>
Date: Fri, 27 Apr 2007 14:43:36 +0000
Subject: [PATCH] Make sure mainContainer and owner are not null

---
 src/jalview/appletgui/Tooltip.java |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/jalview/appletgui/Tooltip.java b/src/jalview/appletgui/Tooltip.java
index 90f2e97..7de5193 100755
--- a/src/jalview/appletgui/Tooltip.java
+++ b/src/jalview/appletgui/Tooltip.java
@@ -137,6 +137,10 @@ public class Tooltip
 
   void setTipLocation(MouseEvent evt)
   {
+    if(mainContainer==null || owner==null)
+    {
+      return;
+    }
     setLocation( (owner.getLocationOnScreen().x
                   - mainContainer.getLocationOnScreen().x) + evt.getX(),
                 (owner.getLocationOnScreen().y -
-- 
1.7.10.2