diff --git a/access/grpc/convert/convert.go b/access/grpc/convert/convert.go
index ea8a1eaa6..b93003231 100644
--- a/access/grpc/convert/convert.go
+++ b/access/grpc/convert/convert.go
@@ -268,9 +268,9 @@ func MessageToBlockHeader(m *entities.BlockHeader) (flow.BlockHeader, error) {
 		timestamp = m.GetTimestamp().AsTime()
 	}
 
-	tc, err := MessageToTimeoutCertificate(m.GetLastViewTc())
+	timeoutCertificate, err := MessageToTimeoutCertificate(m.GetLastViewTc())
 	if err != nil {
-		return flow.BlockHeader{}, err
+		return flow.BlockHeader{}, fmt.Errorf("error converting timeout certificate: %w", err)
 	}
 
 	return flow.BlockHeader{
@@ -285,19 +285,20 @@ func MessageToBlockHeader(m *entities.BlockHeader) (flow.BlockHeader, error) {
 		ProposerSigData:            m.GetProposerSigData(),
 		ChainID:                    flow.HashToID([]byte(m.GetChainId())),
 		ParentVoterIndices:         m.GetParentVoterIndices(),
-		LastViewTimeoutCertificate: tc,
+		LastViewTimeoutCertificate: timeoutCertificate,
 		ParentView:                 m.GetParentView(),
 	}, nil
 }
 
 func MessageToTimeoutCertificate(m *entities.TimeoutCertificate) (flow.TimeoutCertificate, error) {
 	if m == nil {
-		return flow.TimeoutCertificate{}, ErrEmptyMessage
+		// timeout certificate can be nil
+		return flow.TimeoutCertificate{}, nil
 	}
 
 	qc, err := MessageToQuorumCertificate(m.GetHighestQc())
 	if err != nil {
-		return flow.TimeoutCertificate{}, err
+		return flow.TimeoutCertificate{}, fmt.Errorf("error converting quorum certificate: %w", err)
 	}
 
 	return flow.TimeoutCertificate{
@@ -326,7 +327,7 @@ func TimeoutCertificateToMessage(tc flow.TimeoutCertificate) (*entities.TimeoutC
 
 func MessageToQuorumCertificate(m *entities.QuorumCertificate) (flow.QuorumCertificate, error) {
 	if m == nil {
-		return flow.QuorumCertificate{}, ErrEmptyMessage
+		return flow.QuorumCertificate{}, fmt.Errorf("quourum certificate is empty: %w", ErrEmptyMessage)
 	}
 
 	return flow.QuorumCertificate{
diff --git a/examples/go.mod b/examples/go.mod
index c58c5e374..25d222804 100644
--- a/examples/go.mod
+++ b/examples/go.mod
@@ -7,7 +7,7 @@ toolchain go1.22.4
 replace github.com/onflow/flow-go-sdk => ../
 
 require (
-	github.com/onflow/cadence v1.0.1-0.20241018173327-2e72919b18ac
+	github.com/onflow/cadence v1.2.1
 	github.com/onflow/flow-cli/flowkit v1.11.0
 	github.com/onflow/flow-go-sdk v0.41.17
 	github.com/spf13/afero v1.11.0
diff --git a/examples/go.sum b/examples/go.sum
index 6ef27de99..e80f1bdfe 100644
--- a/examples/go.sum
+++ b/examples/go.sum
@@ -120,6 +120,7 @@ github.com/onflow/cadence v1.0.0-preview.38/go.mod h1:jOwvPSSLTr9TvaKMs7KKiBYMmp
 github.com/onflow/cadence v1.0.0-preview.52/go.mod h1:7wvvecnAZtYOspLOS3Lh+FuAmMeSrXhAWiycC3kQ1UU=
 github.com/onflow/cadence v1.0.0/go.mod h1:7wvvecnAZtYOspLOS3Lh+FuAmMeSrXhAWiycC3kQ1UU=
 github.com/onflow/cadence v1.0.1-0.20241018173327-2e72919b18ac/go.mod h1:fJxxOAp1wnWDfOHT8GOc1ypsU0RR5E3z51AhG8Yf5jg=
+github.com/onflow/cadence v1.2.1/go.mod h1:fJxxOAp1wnWDfOHT8GOc1ypsU0RR5E3z51AhG8Yf5jg=
 github.com/onflow/crypto v0.25.0 h1:BeWbLsh3ZD13Ej+Uky6kg1PL1ZIVBDVX+2MVBNwqddg=
 github.com/onflow/crypto v0.25.0/go.mod h1:C8FbaX0x8y+FxWjbkHy0Q4EASCDR9bSPWZqlpCLYyVI=
 github.com/onflow/crypto v0.25.1/go.mod h1:C8FbaX0x8y+FxWjbkHy0Q4EASCDR9bSPWZqlpCLYyVI=