Fix password auth proof serialization

src/models/UserPasswordComponent.ts

@@ -58,6 +58,7 @@ export class PasswordAuthProof implements AuthProof<User> {
     }
 
     public async getResource(): Promise<User | null> {
+        if (typeof this.userId !== 'number') return null;
         return await User.getById(this.userId);
     }
 
@@ -71,11 +72,7 @@ export class PasswordAuthProof implements AuthProof<User> {
     }
 
     public async isValid(): Promise<boolean> {
-        if (typeof this.userId === 'number') {
-            return Boolean(await this.getResource());
-        } else {
-            return await this.isAuthorized();
-        }
+        return Boolean(await this.getResource());
     }
 
     public async revoke(): Promise<void> {
@@ -101,7 +98,7 @@ export class PasswordAuthProof implements AuthProof<User> {
     private save() {
         this.session.auth_password_proof = {
             authorized: this.authorized,
-            userID: this.userId,
+            userId: this.userId,
         };
     }
 }