diff --git a/web/src/stores/budget-account.ts b/web/src/stores/budget-account.ts
index 1de29ba..becea06 100644
--- a/web/src/stores/budget-account.ts
+++ b/web/src/stores/budget-account.ts
@@ -61,8 +61,15 @@ export const useAccountStore = defineStore("budget/account", {
         },
         GetIncomeAvailable(state) {
             return (year: number, month: number) => {
+                const IncomeCategoryID = this.GetIncomeCategoryID;
+                if(IncomeCategoryID == null)
+                    return 0;
+
                 const categories = this.AllCategoriesForMonth(year, month);
-                return categories.filter(x => x.ID == this.GetIncomeCategoryID)[0].AvailableLastMonth;
+                const category = categories.filter(x => x.ID == IncomeCategoryID)[0];
+                if (category == null)
+                    return 0;
+                return category.AvailableLastMonth;
             }
         },
         CategoryGroupsForMonth(state) {