diff --git a/lib/proto/a_interface_test.go b/lib/proto/a_interface_test.go
index 93ea4e0a..c7578204 100644
--- a/lib/proto/a_interface_test.go
+++ b/lib/proto/a_interface_test.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"reflect"
+	"time"
 
 	"github.com/go-rod/rod/lib/proto"
 	"github.com/go-rod/rod/lib/utils"
@@ -73,6 +74,10 @@ func (t T) TimeCodec() {
 	data, err = json.Marshal(datetime)
 	t.E(err)
 	t.Eq(raw, data)
+
+	var sessionExpires proto.TimeSinceEpoch = -1
+	var zeroTime time.Time
+	t.Eq(sessionExpires.Time(), zeroTime)
 }
 
 func (t T) Rect() {
diff --git a/lib/proto/a_patch.go b/lib/proto/a_patch.go
index 3d5c5d54..f1c8cc05 100644
--- a/lib/proto/a_patch.go
+++ b/lib/proto/a_patch.go
@@ -16,6 +16,9 @@ type TimeSinceEpoch float64
 
 // Time interface.
 func (t TimeSinceEpoch) Time() time.Time {
+	if t == -1 {
+		return time.Time{}
+	}
 	return (time.Unix(0, 0)).Add(
 		time.Duration(t * TimeSinceEpoch(time.Second)),
 	)