diff --git a/README.md b/README.md
index c81d8bc6..16bd1ac2 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # angular-oauth2-oidc
 
-Support for OAuth 2 and OpenId Connect (OIDC) in Angular. 
+Support for OAuth 2 and OpenId Connect (OIDC) in Angular. Already prepared for the upcoming OAuth 2.1.
 
 ![OIDC Certified Logo](https://raw.githubusercontent.com/manfredsteyer/angular-oauth2-oidc/master/oidc.png)
 
@@ -43,7 +43,7 @@ Please note, that this dependency is not needed for the **code flow**, which is
 
 Successfully tested with **Angular 9** and its Router, PathLocationStrategy as well as HashLocationStrategy and CommonJS-Bundling via webpack. At server side we've used IdentityServer (.NET / .NET Core) and Redhat's Keycloak (Java).
 
-**Angular 9**: Use 9.x versions of this library.
+**Angular 9**: Use 9.x versions of this library (should also work with older Angular versions!).
 
 **Angular 8**: Use 8.x versions of this library.
 
@@ -84,6 +84,7 @@ Successfully tested with **Angular 9** and its Router, PathLocationStrategy as w
 - Validating claims of the id_token regarding the specs
 - Hook for further custom validations
 - Single-Sign-Out by redirecting to the auth-server's logout-endpoint
+- Tested with all modern browsers and IE
 
 ## Sample-Auth-Server
 
diff --git a/projects/lib/src/oauth-service.ts b/projects/lib/src/oauth-service.ts
index 40af190a..3119d627 100644
--- a/projects/lib/src/oauth-service.ts
+++ b/projects/lib/src/oauth-service.ts
@@ -1225,7 +1225,7 @@ export class OAuthService extends AuthConfig implements OnDestroy {
         }
     }
 
-    protected checkSession(): void {
+    public checkSession(): void {
         const iframe: any = document.getElementById(this.sessionCheckIFrameName);
 
         if (!iframe) {
@@ -1440,9 +1440,12 @@ export class OAuthService extends AuthConfig implements OnDestroy {
         customParameters?: Map<string, string>
     ): void {
         this._storage.setItem('access_token', accessToken);
-        if (grantedScopes) {
+        if (grantedScopes && !Array.isArray(grantedScopes)) {
             this._storage.setItem('granted_scopes', JSON.stringify(grantedScopes.split('+')));
+        } else if (grantedScopes && Array.isArray(grantedScopes)) {
+            this._storage.setItem('granted_scopes', JSON.stringify(grantedScopes));
         }
+
         this._storage.setItem('access_token_stored_at', '' + Date.now());
         if (expiresIn) {
             const expiresInMilliSeconds = expiresIn * 1000;