diff -u -r1.10 -r1.11
--- Line.java	15 Jul 2006 09:38:56 -0000	1.10
+++ Line.java	8 Jun 2007 21:29:53 -0000	1.11
@@ -10,7 +10,7 @@

 /**
  * A straight line
  * @author tonyj

- * @version $Id: Line.java,v 1.10 2006/07/15 09:38:56 jstrube Exp $

+ * @version $Id: Line.java,v 1.11 2007/06/08 21:29:53 ngraf Exp $

  */
 public class Line implements Trajectory
 {

@@ -65,12 +65,15 @@

        double[] distances = this.findInterceptsOnCylinder(r);
        // Which is the best?
        double bestDistance = -1.0;

-       for (int i=0; i<distances.length; i++) {
-           if (distances[i] >= 0.0) {
-               // Potentially valid -- is it the best so far?
-               if (bestDistance<0.0 || distances[i]<bestDistance) {
-                   // Yes!
-                   bestDistance = distances[i];

+       if (distances != null)
+       {
+           for (int i=0; i<distances.length; i++) {
+               if (distances[i] >= 0.0) {
+                   // Potentially valid -- is it the best so far?
+                   if (bestDistance<0.0 || distances[i]<bestDistance) {
+                       // Yes!
+                       bestDistance = distances[i];
+                   }

                }
            }
        }