diff --git a/oidc/src/main/java/de/bstly/we/oidc/businesslogic/model/OidcTokenResponse.java b/oidc/src/main/java/de/bstly/we/oidc/businesslogic/model/OidcTokenResponse.java
index b256b6a..788ae76 100644
--- a/oidc/src/main/java/de/bstly/we/oidc/businesslogic/model/OidcTokenResponse.java
+++ b/oidc/src/main/java/de/bstly/we/oidc/businesslogic/model/OidcTokenResponse.java
@@ -56,7 +56,7 @@ public class OidcTokenResponse {
 	 * @return the refresh token
 	 */
 	public String getRefresh_token() {
-		return refresh_token;
+		return refresh_token != null ? refresh_token : "";
 	}
 
 	/**
diff --git a/pom.xml b/pom.xml
index bcff42a..da01861 100755
--- a/pom.xml
+++ b/pom.xml
@@ -14,7 +14,7 @@
 		<java.version>17</java.version>
 		<querydsl.version>5.0.0</querydsl.version>
 		<nimbus.version>9.37.3</nimbus.version>
-		<revision>3.0.7-SNAPSHOT</revision>
+		<revision>3.0.8-SNAPSHOT</revision>
 	</properties>
 
 	<parent>