diff --git a/backend/src/services/OAuthService.js b/backend/src/services/OAuthService.js
index 1cd2e81..c166036 100644
--- a/backend/src/services/OAuthService.js
+++ b/backend/src/services/OAuthService.js
@@ -70,6 +70,7 @@ class OAuthService {
         }
 
         authIdentity = await AuthIdentity.create({
+          id: await this.getNextAuthIdentityId(AuthIdentity),
           auth_info_id: authInfo.id,
           provider,
           identity: providerId,
@@ -127,6 +128,7 @@ class OAuthService {
 
           // OAuth-Identity erstellen
           authIdentity = await AuthIdentity.create({
+            id: await this.getNextAuthIdentityId(AuthIdentity),
             auth_info_id: authInfo.id,
             provider,
             identity: providerId,
@@ -139,6 +141,11 @@ class OAuthService {
     return this.createLoginResult(user, authInfo, provider);
   }
 
+  async getNextAuthIdentityId(AuthIdentity) {
+    const maxId = await AuthIdentity.max('id');
+    return Number(maxId || 0) + 1;
+  }
+
   createPendingToken(profile, provider) {
     return jwt.sign(
       {
@@ -288,4 +295,3 @@ class OAuthService {
 }
 
 module.exports = new OAuthService();
-