diff --git a/s1ap_reiniger.py b/s1ap_reiniger.py
index 7b3b088..62791af 100755
--- a/s1ap_reiniger.py
+++ b/s1ap_reiniger.py
@@ -114,8 +114,9 @@ def find_and_handle_s1ap_nested_nas_pdu(msg):
 
 	for item in ie['value'][1]:
 		if item['value'][0] in IEs.values():
-			pdu = handle_nas_pdu(item['value'][1]['nAS-PDU'], dl = True)
-			item['value'][1]['nAS-PDU'] = pdu
+			if 'nAS-PDU' in item['value'][1]:
+				pdu = handle_nas_pdu(item['value'][1]['nAS-PDU'], dl = True)
+				item['value'][1]['nAS-PDU'] = pdu
 
 def handle_s1ap(msg, pkt_number):
 	log.info("Processing S1AP message '%s:%s' (Packet %d)" % (msg[0], msg[1]['value'][0], pkt_number))