diff --git a/backend/services/falukantService.js b/backend/services/falukantService.js
index 527551a..5febd83 100644
--- a/backend/services/falukantService.js
+++ b/backend/services/falukantService.js
@@ -847,9 +847,12 @@ class FalukantService extends BaseService {
                     ]
                 },
             ],
-            attributes: ['id', 'money', 'creditAmount', 'todayCreditTaken']
+            attributes: ['id', 'money', 'creditAmount', 'todayCreditTaken', 'certificate']
         });
         if (!u) throw new Error('User not found');
+        if (u.certificate == null) {
+            u.setDataValue('certificate', 1);
+        }
         // Load UserHouse and HouseType in separate queries to avoid EagerLoadingError
         let userHouse = null;
         if (u.id != null) {
@@ -897,7 +900,7 @@ class FalukantService extends BaseService {
         const nobility = await TitleOfNobility.findOne({ where: { labelTr: 'noncivil' } });
         if (!nobility) throw new Error('No title of nobility found with the label "noncivil".');
         const falukantUser = await FalukantUser.create({
-            userId: user.id, money: 50, creditAmount: 0, todayCreditTaken: 0, creditInterestRate: 0, mainBranchRegionId: region.id
+            userId: user.id, money: 50, creditAmount: 0, todayCreditTaken: 0, creditInterestRate: 0, certificate: 1, mainBranchRegionId: region.id
         });
         const date = new Date(); date.setDate(date.getDate() - 14);
         const ch = await FalukantCharacter.create({
@@ -2017,8 +2020,9 @@ class FalukantService extends BaseService {
         if (!c) {
             throw new Error(`No FalukantCharacter found for user with id ${u.id}`);
         }
+        const effectiveCertificate = u.certificate ?? 1;
         const ps = await ProductType.findAll({
-            where: { category: { [Op.lte]: u.certificate } },
+            where: { category: { [Op.lte]: effectiveCertificate } },
             include: [{ model: Knowledge, as: 'knowledges', attributes: ['knowledge'], where: { characterId: c.id } }],
             attributes: ['labelTr', 'id', 'sellCost', 'productionTime', 'category']
         });