http://nagoya.apache.org/bugzilla/show_bug.cgi?id=13483

Patch from Jens Gerhard

PR:
Obtained from:
Submitted by:
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352928 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/model/Sheet.java

@@ -432,9 +432,10 @@ public class Sheet implements Model
 
     public int getNumMergedRegions()
 	{
-        return merged.getNumAreas();
+	    return merged!=null ? merged.getNumAreas() : 0;
 	}
 
+
     /**
      * This is basically a kludge to deal with the now obsolete Label records.  If
      * you have to read in a sheet that contains Label records, be aware that the rest