diff --git a/src/actions/users.ts b/src/actions/users.ts
index 47b396df9..caec9bc46 100644
--- a/src/actions/users.ts
+++ b/src/actions/users.ts
@@ -363,7 +363,7 @@ export async function addUser(data: {
       providerGroup: validatedData.providerGroup || null,
       tags: validatedData.tags,
       rpm: validatedData.rpm,
-      dailyQuota: validatedData.dailyQuota,
+      dailyQuota: validatedData.dailyQuota ?? undefined,
       limit5hUsd: validatedData.limit5hUsd ?? undefined,
       limitWeeklyUsd: validatedData.limitWeeklyUsd ?? undefined,
       limitMonthlyUsd: validatedData.limitMonthlyUsd ?? undefined,
@@ -545,7 +545,7 @@ export async function createUserOnly(data: {
       providerGroup: validatedData.providerGroup || null,
       tags: validatedData.tags,
       rpm: validatedData.rpm,
-      dailyQuota: validatedData.dailyQuota,
+      dailyQuota: validatedData.dailyQuota ?? undefined,
       limit5hUsd: validatedData.limit5hUsd ?? undefined,
       limitWeeklyUsd: validatedData.limitWeeklyUsd ?? undefined,
       limitMonthlyUsd: validatedData.limitMonthlyUsd ?? undefined,
@@ -698,12 +698,12 @@ export async function editUser(
       providerGroup: validatedData.providerGroup,
       tags: validatedData.tags,
       rpm: validatedData.rpm,
-      dailyQuota: validatedData.dailyQuota,
-      limit5hUsd: validatedData.limit5hUsd,
-      limitWeeklyUsd: validatedData.limitWeeklyUsd,
-      limitMonthlyUsd: validatedData.limitMonthlyUsd,
-      limitTotalUsd: validatedData.limitTotalUsd,
-      limitConcurrentSessions: validatedData.limitConcurrentSessions,
+      dailyQuota: validatedData.dailyQuota ?? undefined,
+      limit5hUsd: validatedData.limit5hUsd ?? undefined,
+      limitWeeklyUsd: validatedData.limitWeeklyUsd ?? undefined,
+      limitMonthlyUsd: validatedData.limitMonthlyUsd ?? undefined,
+      limitTotalUsd: validatedData.limitTotalUsd ?? undefined,
+      limitConcurrentSessions: validatedData.limitConcurrentSessions ?? undefined,
       dailyResetMode: validatedData.dailyResetMode,
       dailyResetTime: validatedData.dailyResetTime,
       isEnabled: validatedData.isEnabled,
diff --git a/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx b/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx
index 017d113d2..8782587ef 100644
--- a/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx
+++ b/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx
@@ -118,7 +118,7 @@ export function UserForm({ user, onSuccess, currentUser }: UserFormProps) {
               name: data.name,
               note: data.note,
               rpm: data.rpm,
-              dailyQuota: data.dailyQuota,
+              dailyQuota: data.dailyQuota ?? undefined,
               providerGroup: data.providerGroup || null,
               tags: data.tags,
               limit5hUsd: data.limit5hUsd,
@@ -136,7 +136,7 @@ export function UserForm({ user, onSuccess, currentUser }: UserFormProps) {
               name: data.name,
               note: data.note,
               rpm: data.rpm,
-              dailyQuota: data.dailyQuota,
+              dailyQuota: data.dailyQuota ?? undefined,
               providerGroup: data.providerGroup || null,
               tags: data.tags,
               limit5hUsd: data.limit5hUsd,
diff --git a/src/repository/user.ts b/src/repository/user.ts
index ad220ce7c..381c2d88f 100644
--- a/src/repository/user.ts
+++ b/src/repository/user.ts
@@ -157,17 +157,19 @@ export async function updateUser(id: number, userData: UpdateUserData): Promise<
   if (userData.description !== undefined) dbData.description = userData.description;
   if (userData.rpm !== undefined) dbData.rpmLimit = userData.rpm;
   if (userData.dailyQuota !== undefined)
-    dbData.dailyLimitUsd = userData.dailyQuota === null ? null : userData.dailyQuota.toString();
+    dbData.dailyLimitUsd =
+      userData.dailyQuota === null ? undefined : userData.dailyQuota.toString();
   if (userData.providerGroup !== undefined) dbData.providerGroup = userData.providerGroup;
   if (userData.tags !== undefined) dbData.tags = userData.tags;
   if (userData.limit5hUsd !== undefined)
-    dbData.limit5hUsd = userData.limit5hUsd === null ? null : userData.limit5hUsd.toString();
+    dbData.limit5hUsd =
+      userData.limit5hUsd === null ? undefined : userData.limit5hUsd.toString();
   if (userData.limitWeeklyUsd !== undefined)
     dbData.limitWeeklyUsd =
-      userData.limitWeeklyUsd === null ? null : userData.limitWeeklyUsd.toString();
+      userData.limitWeeklyUsd === null ? undefined : userData.limitWeeklyUsd.toString();
   if (userData.limitMonthlyUsd !== undefined)
     dbData.limitMonthlyUsd =
-      userData.limitMonthlyUsd === null ? null : userData.limitMonthlyUsd.toString();
+      userData.limitMonthlyUsd === null ? undefined : userData.limitMonthlyUsd.toString();
   if (userData.limitTotalUsd !== undefined)
     dbData.limitTotalUsd =
       userData.limitTotalUsd === null ? null : userData.limitTotalUsd.toString();