Index: WS/EC/SessionService.cls.xml
===================================================================
diff -u -r33903 -r36511
--- WS/EC/SessionService.cls.xml	(.../SessionService.cls.xml)	(revision 33903)
+++ WS/EC/SessionService.cls.xml	(.../SessionService.cls.xml)	(revision 36511)
@@ -58,6 +58,8 @@
 <ReturnType>APPS.EC.dto.WebshopSessie</ReturnType>
 <WebMethod>1</WebMethod>
 <Implementation><![CDATA[
+	$$$chkRequiredParameter(SessieID)
+	
 	#dim Sessie As APPS.EC.impl.HandelWebshopSessie = ##class(APPS.EC.impl.HandelWebshopSessie).OpenId( SessieID )	
 	Set Taal = ##class(DOM.enu.Taal.AutoComplete).%New()
 	If ##class(TECH.StringUtils).Equals(Sessie.GeefTaal(), Taal.Nederlands, Taal.Engels) {