Enhance error handling in FalukantService: Add validation for product sellCost in calcRegionalSellPrice and getProductPriceInRegion methods, ensuring proper error messages are logged when sellCost is undefined or null.

backend/services/falukantService.js

@@ -101,6 +101,11 @@ async function calcRegionalSellPrice(product, knowledgeFactor, regionId, worthPe
         worthPercent = townWorth?.worthPercent || 50; // Default 50% wenn nicht gefunden
     }
     
+    // Prüfe ob sellCost vorhanden ist
+    if (product.sellCost === null || product.sellCost === undefined) {
+        throw new Error(`Product ${product.id} has no sellCost defined`);
+    }
+    
     // Basispreis basierend auf regionalem worthPercent
     const basePrice = product.sellCost * (worthPercent / 100);
     
@@ -4178,6 +4183,7 @@ class FalukantService extends BaseService {
     }
 
     async getProductPriceInRegion(hashedUserId, productId, regionId) {
+        try {
             const user = await this.getFalukantUserByHashedId(hashedUserId);
             const character = await FalukantCharacter.findOne({ where: { userId: user.id } });
             if (!character) {
@@ -4190,6 +4196,11 @@ class FalukantService extends BaseService {
                 throw new Error(`Product not found with id ${productId}`);
             }
 
+            // Prüfe ob sellCost vorhanden ist
+            if (product.sellCost === null || product.sellCost === undefined) {
+                throw new Error(`Product ${productId} has no sellCost defined`);
+            }
+
             // Knowledge für dieses Produkt abrufen
             const knowledge = await Knowledge.findOne({
                 where: { characterId: character.id, productId: productId }
@@ -4200,6 +4211,10 @@ class FalukantService extends BaseService {
             const price = await calcRegionalSellPrice(product, knowledgeFactor, regionId);
 
             return { price };
+        } catch (error) {
+            console.error(`[getProductPriceInRegion] Error for productId=${productId}, regionId=${regionId}:`, error);
+            throw error;
+        }
     }
 
     async getProductPricesInCities(hashedUserId, productId, currentPrice, currentRegionId = null) {