diff --git a/BACKEND/app/controllers/stations_controller.ts b/BACKEND/app/controllers/stations_controller.ts
index 903758c..b1fbb25 100644
--- a/BACKEND/app/controllers/stations_controller.ts
+++ b/BACKEND/app/controllers/stations_controller.ts
@@ -83,6 +83,14 @@ export default class StationsController {
       await station.save()
 
       if (lines && Array.isArray(lines)) {
+        // Xóa những line không còn trong payload
+        const existingLines = await station.related('lines').query()
+        const existingLineIds = existingLines.map((line) => line.id)
+        const linesToKeepIds = lines.filter((line) => line.id).map((line) => line.id)
+        const linesToDeleteIds = existingLineIds.filter((id) => !linesToKeepIds.includes(id))
+        if (linesToDeleteIds.length > 0) {
+          await Line.query().whereIn('id', linesToDeleteIds).delete()
+        }
         lines.forEach(async (line) => {
           if (line.id) {
             const value = await Line.find(line.id)
diff --git a/BACKEND/app/services/line_connection.ts b/BACKEND/app/services/line_connection.ts
index f864ff9..39d5bd9 100644
--- a/BACKEND/app/services/line_connection.ts
+++ b/BACKEND/app/services/line_connection.ts
@@ -138,6 +138,7 @@ export default class LineConnection {
       this.client.on('close', () => {
         console.log(`🔌 Line ${lineNumber} disconnected`)
         this.config.status = 'disconnected'
+        this.config.inventory = undefined
         this.socketIO.emit('line_disconnected', {
           stationId,
           lineId: id,