patch from Dennis Doubleday http://nagoya.apache.org/bugzilla/show_bug.cgi?id=13076

PR:
Obtained from:
Submitted by:
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352927 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/record/FormulaRecord.java

@@ -545,6 +545,8 @@ public class FormulaRecord
                 .append("\n");
             buffer.append("    .expressionlength= ").append(getExpressionLength())
                 .append("\n");
+
+            if (field_8_parsed_expr != null) {
                 buffer.append("    .numptgsinarray  = ").append(field_8_parsed_expr.size())
                     .append("\n");
             
@@ -560,6 +562,7 @@ public class FormulaRecord
                         .append(((Ptg)field_8_parsed_expr.get(k)).toDebugString())
                         .append("\n");
                 }
+            }
             
             
             buffer.append("[/FORMULA]\n");