diff --git a/apps/api/src/integrations/montify/sync.service.ts b/apps/api/src/integrations/montify/sync.service.ts
index 1a2f6e6..dc6fe1f 100644
--- a/apps/api/src/integrations/montify/sync.service.ts
+++ b/apps/api/src/integrations/montify/sync.service.ts
@@ -156,10 +156,11 @@ export class MontifySyncService {
   ): Promise<MontifyConnectionDto> {
     const row = await this.connections.getOrThrow(organizationId, connectionId);
     if (!row.enabled) throw new BadRequestException('این اتصال غیرفعال است');
-    if (this.running.has(connectionId)) {
-      throw new BadRequestException('همگام‌سازی این فروشگاه در حال اجراست');
+    if (!this.running.has(connectionId)) {
+      await new Promise<void>((started) => {
+        void this.runSync(row, mode, started);
+      });
     }
-    void this.runSync(row, mode);
     return this.connections.getDto(organizationId, connectionId);
   }
 
@@ -175,8 +176,15 @@ export class MontifySyncService {
     }
   }
 
-  private async runSync(row: MontifyConnection, mode: 'incremental' | 'full'): Promise<void> {
-    if (this.running.has(row.id)) return;
+  private async runSync(
+    row: MontifyConnection,
+    mode: 'incremental' | 'full',
+    onStarted?: () => void,
+  ): Promise<void> {
+    if (this.running.has(row.id)) {
+      onStarted?.();
+      return;
+    }
     this.running.add(row.id);
     const startedAt = new Date();
     const result: MontifySyncResultDto = {
@@ -196,14 +204,22 @@ export class MontifySyncService {
         data: { lastSyncResult: result as unknown as Prisma.InputJsonValue },
       });
 
-    await this.prisma.montifyConnection.update({
-      where: { id: row.id },
-      data: {
-        syncStatus: 'running',
-        syncStartedAt: startedAt,
-        lastSyncResult: result as unknown as Prisma.InputJsonValue,
-      },
-    });
+    try {
+      await this.prisma.montifyConnection.update({
+        where: { id: row.id },
+        data: {
+          syncStatus: 'running',
+          syncStartedAt: startedAt,
+          lastSyncResult: result as unknown as Prisma.InputJsonValue,
+        },
+      });
+    } catch (e) {
+      this.running.delete(row.id);
+      this.logger.warn(`Montify sync ${row.id} start: ${e instanceof Error ? e.message : e}`);
+      return;
+    } finally {
+      onStarted?.();
+    }
 
     let cursor = row.customersCursor;
     let fatal: string | null = null;