diff --git a/core/src/main/resources/lib/form/dropdownDescriptorSelector.jelly b/core/src/main/resources/lib/form/dropdownDescriptorSelector.jelly
index aad0a87e5161d71d3cb99f8b05fe1c3d2cf9cb64..7b0ca4df26b5e91780281d969aa6bc626ef7ea1c 100644
--- a/core/src/main/resources/lib/form/dropdownDescriptorSelector.jelly
+++ b/core/src/main/resources/lib/form/dropdownDescriptorSelector.jelly
@@ -57,7 +57,7 @@ THE SOFTWARE.
         lazy="descriptor">
         <l:ajax>
           <j:set var="instance" value="${current.descriptor==descriptor ? current : null}" />
-          <st:include from="${descriptor}" page="${descriptor.configPage}" />
+          <st:include from="${descriptor}" page="${descriptor.configPage}" optional="true" />
         </l:ajax>
       </f:dropdownListBlock>
     </j:forEach>