diff --git a/src/services/sessionService.js b/src/services/sessionService.js
index 96341ec..ea0cc18 100644
--- a/src/services/sessionService.js
+++ b/src/services/sessionService.js
@@ -62,9 +62,9 @@ class SessionServiceProvider {
       });
     };
 
-    async function isSessionAuthorized(sessionUuid) {
+    const isSessionAuthorized = async (sessionUuid) => {
       const isSessionRelatedToPublicKey =
-        await models.SessionRelatedToPublickey.findOne({
+        await this.models.SessionRelatedToPublickey.findOne({
           where: {
             session_uuid: sessionUuid,
           },
@@ -75,7 +75,7 @@ class SessionServiceProvider {
       }
 
       return false;
-    }
+    };
 
     async function getPublicKeyRelatedToSession(sessionUuid) {
       const sessionRelatedToPublickey =