diff --git a/electron/services/config.ts b/electron/services/config.ts
index 4b8324d..bb6b9f5 100644
--- a/electron/services/config.ts
+++ b/electron/services/config.ts
@@ -688,8 +688,16 @@ export class ConfigService {
     }
   }
 
+  private getUserDataPath(): string {
+    const workerUserDataPath = String(process.env.WEFLOW_USER_DATA_PATH || process.env.WEFLOW_CONFIG_CWD || '').trim()
+    if (workerUserDataPath) {
+      return workerUserDataPath
+    }
+    return app?.getPath?.('userData') || process.cwd()
+  }
+
   getCacheBasePath(): string {
-    return join(app.getPath('userData'), 'cache')
+    return join(this.getUserDataPath(), 'cache')
   }
 
   getAll(): Partial<ConfigSchema> {
diff --git a/electron/services/exportService.ts b/electron/services/exportService.ts
index 6929f59..6649e0c 100644
--- a/electron/services/exportService.ts
+++ b/electron/services/exportService.ts
@@ -6945,6 +6945,7 @@ class ExportService {
       if (collected.rows.length === 0) {
         return { success: false, error: '该会话在指定时间范围内没有消息' }
       }
+      const totalMessages = collected.rows.length
 
       const senderUsernames = new Set<string>()
       let senderScanIndex = 0
@@ -6987,6 +6988,7 @@ class ExportService {
         : []
 
       const mediaCache = new Map<string, MediaExportItem | null>()
+      const mediaDirCache = new Set<string>()
 
       if (mediaMessages.length > 0) {
         await this.preloadMediaLookupCaches(sessionId, mediaMessages, {