diff --git a/internal/sbi/consumer/amf_service.go b/internal/sbi/consumer/amf_service.go
index b9401c4c..66112058 100644
--- a/internal/sbi/consumer/amf_service.go
+++ b/internal/sbi/consumer/amf_service.go
@@ -53,7 +53,7 @@ func (s *namfService) N1N2MessageTransfer(
 	}
 
 	rsp, err := client.N1N2MessageCollectionCollectionApi.N1N2MessageTransfer(ctx, n1n2MessageTransferRequest)
-	if err != nil {
+	if err != nil || rsp == nil {
 		return nil, err
 	}
 
diff --git a/internal/sbi/consumer/pcf_service.go b/internal/sbi/consumer/pcf_service.go
index 80f1aae6..386eb76c 100644
--- a/internal/sbi/consumer/pcf_service.go
+++ b/internal/sbi/consumer/pcf_service.go
@@ -102,7 +102,7 @@ func (s *npcfService) SendSMPolicyAssociationCreate(smContext *smf_context.SMCon
 	}
 
 	smPolicyDecisionFromPCF, err := client.SMPoliciesCollectionApi.CreateSMPolicy(ctx, request)
-	if err != nil {
+	if err != nil || smPolicyDecisionFromPCF == nil {
 		return "", nil, err
 	}
 
diff --git a/internal/sbi/processor/association.go b/internal/sbi/processor/association.go
index 305bad13..1ce54d27 100644
--- a/internal/sbi/processor/association.go
+++ b/internal/sbi/processor/association.go
@@ -253,7 +253,7 @@ func (p *Processor) requestAMFToReleasePDUResources(
 	rspData, err := p.Consumer().
 		N1N2MessageTransfer(ctx, smContext.Supi, n1n2Request, smContext.CommunicationClientApiPrefix)
 
-	if err != nil {
+	if err != nil || rspData == nil {
 		logger.ConsumerLog.Warnf("N1N2MessageTransfer for RequestAMFToReleasePDUResources failed: %+v", err)
 		// keep SM Context to avoid inconsistency with AMF
 		smContext.SetState(smf_context.InActive)
diff --git a/internal/sbi/processor/datapath.go b/internal/sbi/processor/datapath.go
index 6aa807e0..7a68379b 100644
--- a/internal/sbi/processor/datapath.go
+++ b/internal/sbi/processor/datapath.go
@@ -272,7 +272,7 @@ func (p *Processor) sendPDUSessionEstablishmentReject(
 	}
 	rspData, err := p.Consumer().
 		N1N2MessageTransfer(ctx, smContext.Supi, n1n2Request, smContext.CommunicationClientApiPrefix)
-	if err != nil {
+	if err != nil || rspData == nil {
 		logger.ConsumerLog.Warnf("N1N2MessageTransfer for SendPDUSessionEstablishmentReject failed: %+v", err)
 		return
 	}
@@ -331,7 +331,7 @@ func (p *Processor) sendPDUSessionEstablishmentAccept(
 
 	rspData, err := p.Consumer().
 		N1N2MessageTransfer(ctx, smContext.Supi, n1n2Request, smContext.CommunicationClientApiPrefix)
-	if err != nil {
+	if err != nil || rspData == nil {
 		logger.ConsumerLog.Warnf("N1N2MessageTransfer for sendPDUSessionEstablishmentAccept failed: %+v", err)
 		return
 	}