diff --git a/internal/control_test_engine/gnb/ngap/dispatcher.go b/internal/control_test_engine/gnb/ngap/dispatcher.go
index f2afbd0..dda0169 100644
--- a/internal/control_test_engine/gnb/ngap/dispatcher.go
+++ b/internal/control_test_engine/gnb/ngap/dispatcher.go
@@ -23,7 +23,7 @@ func Dispatch(amf *context.GNBAmf, gnb *context.GNBContext, message []byte) {
 	// decode NGAP message.
 	ngapMsg, err := ngap.Decoder(message)
 	if err != nil {
-		log.Info("[GNB][NGAP] Error decoding NGAP message in ", gnb.GetGnbId(), " GNB")
+		log.Error("[GNB][NGAP] Error decoding NGAP message in ", gnb.GetGnbId(), " GNB", ": ", err)
 	}
 
 	// check RanUeId and get UE.
diff --git a/internal/control_test_engine/gnb/ngap/handler.go b/internal/control_test_engine/gnb/ngap/handler.go
index 4320f9a..76589ca 100644
--- a/internal/control_test_engine/gnb/ngap/handler.go
+++ b/internal/control_test_engine/gnb/ngap/handler.go
@@ -834,7 +834,8 @@ func HandlerAmfStatusIndication(amf *context.GNBAmf, gnb *context.GNBContext, me
 					if !ok {
 						return true
 					}
-					if amf.GetAmfName() == unavailableGuamiItem.BackupAMFName.Value {
+					if unavailableGuamiItem.BackupAMFName != nil &&
+						amf.GetAmfName() == unavailableGuamiItem.BackupAMFName.Value {
 						backupAmf = amf
 						return false
 					}
@@ -842,6 +843,10 @@ func HandlerAmfStatusIndication(amf *context.GNBAmf, gnb *context.GNBContext, me
 					return true
 				})
 
+				if backupAmf == nil {
+					return
+				}
+
 				amfPool.Range(func(k, v any) bool {
 					oldAmf, ok := v.(*context.GNBAmf)
 					if !ok {