diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/ClientPluginFactory.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/ClientPluginFactory.java
index 87e54f3380880a8a9b25c5fc1d2ea6cf98097d98..115e0b1898966d4da1155d4a517e2b813509c2eb 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/ClientPluginFactory.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/ClientPluginFactory.java
@@ -404,7 +404,7 @@ public final class ClientPluginFactory extends AbstractClientPluginFactory<Scree
             {
                 String permId = entity.getPermId();
                 return createImageDataSetViewer(entity,
-                        WellLocation.parseLocationStr(permId.substring(permId.indexOf(':'))));
+                        WellLocation.parseLocationStr(permId.substring(permId.indexOf(':') + 1)));
             } else if (datasetTypeCode
                     .matches(ScreeningConstants.ANY_HCS_IMAGE_DATASET_TYPE_PATTERN))
             {