diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/business/bo/samplelister/SampleListingWorker.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/business/bo/samplelister/SampleListingWorker.java
index 6e797e6a5c6707fd762c4dfb1fd14f2027e7d32d..cc1279a853b0897bb770cc3d6b994fe065e8b17e 100644
--- a/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/business/bo/samplelister/SampleListingWorker.java
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/business/bo/samplelister/SampleListingWorker.java
@@ -367,7 +367,7 @@ final class SampleListingWorker extends AbstractLister
 
     private Iterable<SampleRecord> tryGetIteratorForContainerSamplesByCodes()
     {
-        if (criteria.isSearchForContainerSamplesOnly())
+        if (false == criteria.isSearchForContainerSamplesOnly())
         {
             return null;
         }