diff --git a/pkg/core/state/notification_event.go b/pkg/core/state/notification_event.go
index 06e77184a..87ea9dbb1 100644
--- a/pkg/core/state/notification_event.go
+++ b/pkg/core/state/notification_event.go
@@ -101,7 +101,7 @@ type notificationEventAux struct {
 func (ne NotificationEvent) MarshalJSON() ([]byte, error) {
 	item, err := stackitem.ToJSONWithTypes(ne.Item)
 	if err != nil {
-		item = []byte(`"error: recursive reference"`)
+		item = []byte(fmt.Sprintf(`"error: %v"`, err))
 	}
 	return json.Marshal(&notificationEventAux{
 		ScriptHash: ne.ScriptHash,
@@ -191,12 +191,11 @@ type executionAux struct {
 
 // MarshalJSON implements implements json.Marshaler interface.
 func (e Execution) MarshalJSON() ([]byte, error) {
-	var errRecursive = []byte(`"error: recursive reference"`)
 	arr := make([]json.RawMessage, len(e.Stack))
 	for i := range arr {
 		data, err := stackitem.ToJSONWithTypes(e.Stack[i])
 		if err != nil {
-			data = errRecursive
+			data = []byte(fmt.Sprintf(`"error: %v"`, err))
 		}
 		arr[i] = data
 	}
diff --git a/pkg/rpc/response/result/invoke.go b/pkg/rpc/response/result/invoke.go
index cbd2740f0..83685a7ac 100644
--- a/pkg/rpc/response/result/invoke.go
+++ b/pkg/rpc/response/result/invoke.go
@@ -70,7 +70,7 @@ func (r Invoke) MarshalJSON() ([]byte, error) {
 			for j := range iteratorValues {
 				value[j], err = stackitem.ToJSONWithTypes(iteratorValues[j])
 				if err != nil {
-					st = []byte(`"error: recursive reference"`)
+					st = []byte(fmt.Sprintf(`"error: %v"`, err))
 					break
 				}
 			}
@@ -85,7 +85,7 @@ func (r Invoke) MarshalJSON() ([]byte, error) {
 		} else {
 			data, err = stackitem.ToJSONWithTypes(r.Stack[i])
 			if err != nil {
-				st = []byte(`"error: recursive reference"`)
+				st = []byte(fmt.Sprintf(`"error: %v"`, err))
 				break
 			}
 		}