Bug fix: Fixed NullPointer in class NullValueColorHandler.

Author: GWA

sql12/core/doc/changes.txt

@@ -79,6 +79,8 @@ Table cell data popup now offers find, Xml/Json-reformatting and export function
 
 Bug fixes:
 
+Fixed NullPointer in class NullValueColorHandler.
+
 https://github.com/squirrel-sql-client/squirrel-sql-code/issues/46
   Excel export: The "Auto filter" option activated the auto filter for
   one extra (empty) column at the end of the Excel sheet.

sql12/core/src/net/sourceforge/squirrel_sql/fw/datasetviewer/coloring/NullValueColorHandler.java

@@ -1,12 +1,12 @@
 package net.sourceforge.squirrel_sql.fw.datasetviewer.coloring;
 
+import java.awt.Color;
+
 import net.sourceforge.squirrel_sql.client.Main;
 import net.sourceforge.squirrel_sql.client.session.ISession;
 import net.sourceforge.squirrel_sql.client.session.properties.SessionProperties;
 import net.sourceforge.squirrel_sql.fw.datasetviewer.DataSetViewerTable;
 
-import java.awt.Color;
-
 public class NullValueColorHandler
 {
    private boolean _colorNullValues;
@@ -56,12 +56,18 @@ private void checkForPropertiesUpdates()
 
       _lastPropertiesCheckTime = currentTimeMillis;
 
+      if( null != _dataSetViewerTable.getSessionOrNull() )
+      {
+         return;
+      }
+
       if(   _nullValueColor.getRGB() != _dataSetViewerTable.getSessionOrNull().getProperties().getNullValueColorRGB()
-         || _colorNullValues != _dataSetViewerTable.getSessionOrNull().getProperties().isColorNullValues())
+            || _colorNullValues != _dataSetViewerTable.getSessionOrNull().getProperties().isColorNullValues())
       {
          _nullValueColor = new Color(_dataSetViewerTable.getSessionOrNull().getProperties().getNullValueColorRGB());
          _colorNullValues = _dataSetViewerTable.getSessionOrNull().getProperties().isColorNullValues();
          _dataSetViewerTable.repaint();
       }
+
    }
 }