X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fjalview%2Fappletgui%2FTooltip.java;h=7de5193a4f58a2c84a27d8e629e909b6ed0ace46;hb=4741fc6fc72b7c5ffd75af5b1bc17070fef448f9;hp=90f2e97263d148b64f34e1a8226f631a2a9f777b;hpb=7bc226b58110fa26d9dbd3f0c78095d06909ffc3;p=jalview.git

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 -