- JButton start = (JButton)selectedButtons.elementAt(selectedButtons.size()-1);\r
- JButton end = (JButton) e.getSource();\r
+ JButton start, end = (JButton) e.getSource();\r
+ if(selectedButtons.size()>1)\r
+ start = (JButton)selectedButtons.elementAt(selectedButtons.size()-1);\r
+ else\r
+ start = (JButton) e.getSource();\r
+\r