diff --git a/src/lib/actions/entityCreateUpdate.ts b/src/lib/actions/entityCreateUpdate.ts
index 01eda35..a1d4101 100644
--- a/src/lib/actions/entityCreateUpdate.ts
+++ b/src/lib/actions/entityCreateUpdate.ts
@@ -33,7 +33,7 @@ export default async function entityCreateUpdate({
                     data: {
                         name: name,
                         type: type,
-                        defaultCategoryId: defaultCategoryId,
+                        defaultCategoryId: defaultCategoryId ?? null,
                     },
                 },
             );
@@ -49,7 +49,7 @@ export default async function entityCreateUpdate({
                     userId: user.id,
                     name: name,
                     type: type,
-                    defaultCategoryId: defaultCategoryId,
+                    defaultCategoryId: defaultCategoryId ?? null,
                 },
             });
 
diff --git a/src/lib/actions/paymentCreateUpdate.ts b/src/lib/actions/paymentCreateUpdate.ts
index 6f889ef..a321062 100644
--- a/src/lib/actions/paymentCreateUpdate.ts
+++ b/src/lib/actions/paymentCreateUpdate.ts
@@ -38,7 +38,7 @@ export default async function paymentCreateUpdate({
                         date: date,
                         payorId: payorId,
                         payeeId: payeeId,
-                        categoryId: categoryId,
+                        categoryId: categoryId ?? null,
                         note: note,
                     },
                 },
@@ -57,7 +57,7 @@ export default async function paymentCreateUpdate({
                     date: date,
                     payorId: payorId,
                     payeeId: payeeId,
-                    categoryId: categoryId,
+                    categoryId: categoryId ?? null,
                     note: note,
                 },
             });