diff --git a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/Selectionbox.java b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/Selectionbox.java
index 38c7a49f..418c197f 100644
--- a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/Selectionbox.java
+++ b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/Selectionbox.java
@@ -43,7 +43,7 @@ protected Widget initWidget() {
 		getSelect().clear();
 
 		if (!isRequired()) {
-			getSelect().addItem(translation.notSelected(), (String) null);
+			getSelect().addItem(translation.notSelected(), "");
 		}
 
 		Map<String, String> opts = parseItemOptions();