Fix sessionManager type errors

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@chatenium/chatenium-sdk",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "A library for interacting with the Chatenium API",
   "type": "module",
   "main": "dist/index.js",

src/services/sessionManager.ts

@@ -112,7 +112,7 @@ export class SessionManager {
             }
 
             const updatedUserData = await this.updateUserData(session);
-            this.database.set("sessions", session.userData.userid, updatedUserData);
+            this.database.set("sessions", session.userData.userid, JSON.stringify(updatedUserData.userData));
             activeSessions.push(updatedUserData);
         }