diff --git a/api/cashu/types.go b/api/cashu/types.go
index ad5b570..4bb16c7 100644
--- a/api/cashu/types.go
+++ b/api/cashu/types.go
@@ -546,7 +546,7 @@ type RecoverSigDB struct {
 	B_        string              `json:"B_" db:"B_"`
 	C_        string              `json:"C_" db:"C_"`
 	CreatedAt int64               `json:"created_at" db:"created_at"`
-	Dleq      *BlindSignatureDLEQ `json:"dleq"`
+	Dleq      *BlindSignatureDLEQ `json:"dleq,omitempty"`
 }
 
 func (r RecoverSigDB) GetSigAndMessage() (BlindSignature, BlindedMessage) {
@@ -565,6 +565,7 @@ func (r RecoverSigDB) GetBlindSignature() BlindSignature {
 		Amount: r.Amount,
 		Id:     r.Id,
 		C_:     r.C_,
+		Dleq:   r.Dleq,
 	}
 }
 
@@ -614,6 +615,12 @@ func (b *BlindSignatureDLEQ) UnmarshalJSON(data []byte) error {
 }
 
 func (b *BlindSignatureDLEQ) MarshalJSON() ([]byte, error) {
+	if b == nil {
+		return []byte("null"), nil
+	}
+	if b.E == nil || b.S == nil {
+		return []byte("null"), nil
+	}
 
 	return json.Marshal(&struct {
 		E string `json:"e"` // We want to encode the E as a string
diff --git a/internal/database/postgresql/main.go b/internal/database/postgresql/main.go
index e69909e..86ad6e9 100644
--- a/internal/database/postgresql/main.go
+++ b/internal/database/postgresql/main.go
@@ -357,6 +357,10 @@ func privateKeysToDleq(s_key *string, e_key *string, dleq *cashu.BlindSignatureD
 	if s_key == nil || e_key == nil {
 		return nil
 	}
+	if *s_key == "" || *e_key == "" {
+		return nil
+	}
+
 	sBytes, err := hex.DecodeString(*s_key)
 	if err != nil {
 		return errors.New("failed to decode 's' field")
@@ -398,6 +402,7 @@ func (pql Postgresql) GetRestoreSigsFromBlindedMessages(B_ []string) ([]cashu.Re
 		if err != nil {
 			return nil, databaseError(fmt.Errorf("row.Scan(&sig.Amount, &sig.Id, &sig.B_, &sig.C_, &sig.CreatedAt, &sig.Dleq.E, &sig.Dleq.S): %w", err))
 		}
+
 		err = privateKeysToDleq(&dleq_s_str, &dleq_e_str, sig.Dleq)
 		if err != nil {
 			return nil, databaseError(fmt.Errorf("privateKeysToDleq(dleq_s_str, dleq_e_str, sig.Dleq). %w", err))