X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FColumnSelection.java;h=4904495ee9ad8b919fecee944b3a8668900b6148;hb=449db06a788539e8ea7463ff4b56f012280994d0;hp=6ef179905a6619bd85644bf000172663850bbec3;hpb=7bc226b58110fa26d9dbd3f0c78095d06909ffc3;p=jalview.git

diff --git a/src/jalview/datamodel/ColumnSelection.java b/src/jalview/datamodel/ColumnSelection.java
index 6ef1799..4904495 100644
--- a/src/jalview/datamodel/ColumnSelection.java
+++ b/src/jalview/datamodel/ColumnSelection.java
@@ -578,9 +578,9 @@ public class ColumnSelection
   }
 
   /**
-   * THis method returns the rightmost limit of a
+   * This method returns the leftmost limit of a
    * region of an alignment with hidden columns.
-   * In otherwords, the next hidden column.
+   * In otherwords, the previous hidden column.
    * @param index int
    */
   public int getHiddenBoundaryLeft(int alPos)
@@ -727,14 +727,16 @@ public class ColumnSelection
 
   public boolean isVisible(int column)
   {
-    for (int i = 0; i < hiddenColumns.size(); i++)
-    {
-      int[] region = (int[]) hiddenColumns.elementAt(i);
-      if (column >= region[0] && column <= region[1])
+    if (hiddenColumns != null)
+      for (int i = 0; i < hiddenColumns.size(); i++)
       {
-        return false;
+        int[] region = (int[]) hiddenColumns.elementAt(i);
+        if (column >= region[0] && column <= region[1])
+        {
+          return false;
+        }
       }
-    }
+
     return true;
   }