=== modified file 'dhis-2/dhis-services/dhis-service-tracker/src/main/java/org/hisp/dhis/program/DefaultProgramIndicatorService.java'
--- dhis-2/dhis-services/dhis-service-tracker/src/main/java/org/hisp/dhis/program/DefaultProgramIndicatorService.java	2015-06-18 10:54:01 +0000
+++ dhis-2/dhis-services/dhis-service-tracker/src/main/java/org/hisp/dhis/program/DefaultProgramIndicatorService.java	2015-06-18 14:54:01 +0000
@@ -280,6 +280,11 @@
     @Override
     public String getExpressionDescription( String expression )
     {
+        if ( expression == null )
+        {
+            return null;
+        }
+        
         StringBuffer description = new StringBuffer();
 
         Matcher matcher = ProgramIndicator.EXPRESSION_PATTERN.matcher( expression );