diff --git a/server.go b/server.go
index b3f4ef6..c6987c2 100644
--- a/server.go
+++ b/server.go
@@ -354,9 +354,14 @@ func ConvertInterface(from interface{}, toType reflect.Type) reflect.Value {
 	case reflect.Bool:
 		val, _ := strconv.ParseBool(from.(string))
 		return reflect.ValueOf(val)
+
+	case reflect.String:
+		if toType == reflect.TypeOf(primitive.ObjectID{}) {
+			objid, _ := primitive.ObjectIDFromHex(from.(string))
+			return reflect.ValueOf(objid)
+		}
 	}
 
-	logger.Println("ConvertInterface :", fromtype.String(), toType.String(), toType.Kind().String())
 	return fromrv.Convert(toType)
 }