diff --git a/x/jsonx/iso8601.go b/x/jsonx/iso8601.go
index 464dba73..c5d22b8e 100644
--- a/x/jsonx/iso8601.go
+++ b/x/jsonx/iso8601.go
@@ -104,6 +104,8 @@ func (t *ISO8601) Scan(src interface{}) error {
 			return err
 		}
 		*t = tt
+	case nil:
+		*t = ISO8601(time.Time{})
 	default:
 		return fmt.Errorf("ISO8601: unknown type of: %T", v)
 	}
diff --git a/x/jsonx/kitchen_time.go b/x/jsonx/kitchen_time.go
index 12197718..35f8a16c 100644
--- a/x/jsonx/kitchen_time.go
+++ b/x/jsonx/kitchen_time.go
@@ -100,6 +100,8 @@ func (t *KitckenTime) Scan(src interface{}) error {
 			return err
 		}
 		*t = tt
+	case nil:
+		*t = KitckenTime(time.Time{})
 	default:
 		return fmt.Errorf("KitckenTime: unknown type of: %T", v)
 	}
diff --git a/x/jsonx/simple_date.go b/x/jsonx/simple_date.go
index df8d20e9..cb56cd9d 100644
--- a/x/jsonx/simple_date.go
+++ b/x/jsonx/simple_date.go
@@ -105,6 +105,8 @@ func (t *SimpleDate) Scan(src interface{}) error {
 			return err
 		}
 		*t = tt
+	case nil:
+		*t = SimpleDate(time.Time{})
 	default:
 		return fmt.Errorf("SimpleDate: unknown type of: %T", v)
 	}