From 22db4e17905c059840d23e3587ab5a65778417cc Mon Sep 17 00:00:00 2001
From: Rene Nulsch <33263735+ReneNulschDE@users.noreply.github.com>
Date: Tue, 18 Feb 2025 15:27:31 +0100
Subject: [PATCH] Mercedes: fix refresh token handling (#18893)

---
 vehicle/mercedes/identity.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vehicle/mercedes/identity.go b/vehicle/mercedes/identity.go
index c329aa1de..ac0d744ab 100644
--- a/vehicle/mercedes/identity.go
+++ b/vehicle/mercedes/identity.go
@@ -117,6 +117,10 @@ func (v *Identity) RefreshToken(token *oauth2.Token) (*oauth2.Token, error) {
 		return nil, err
 	}
 
+	if res.RefreshToken == "" {
+		res.RefreshToken = token.RefreshToken
+	}
+
 	tok := util.TokenWithExpiry(&res)
 	v.TokenSource = oauth.RefreshTokenSource(tok, v)