diff --git a/XLSReport.mpr b/XLSReport.mpr
index 312685d..78bf00b 100644
Binary files a/XLSReport.mpr and b/XLSReport.mpr differ
diff --git a/javasource/xlsreport/report/DataOQL.java b/javasource/xlsreport/report/DataOQL.java
index a7bed6b..0f70d70 100644
--- a/javasource/xlsreport/report/DataOQL.java
+++ b/javasource/xlsreport/report/DataOQL.java
@@ -299,6 +299,12 @@ private void addWhereClause(List<IMendixObject> constrainList, ObjectData mainOb
 					case SmallerEqual:
 						this.WHERE.append(" <= ").append(compare);
 						break;
+					case NotEmpty:
+						this.WHERE.append(" != NULL");
+						break;
+					case _empty:
+						this.WHERE.append(" = NULL");
+						break;
 					default:
 						break;
 				}