Update

BACKEND/app/services/line_connection.ts

@@ -146,9 +146,9 @@ export default class LineConnection {
         this.socketIO.emit('line_error', {
           stationId,
           lineId: id,
-          error: err.message + '\r\n',
+          error: '\n' + err.message + '\n',
         })
-        reject(err)
+        resolve()
       })
 
       this.client.on('close', () => {

BACKEND/providers/socket_io_provider.ts

@@ -548,7 +548,8 @@ export class WebSocketIo {
           }
         }
       } catch (err: any) {
-        io.emit('line_error', { lineId, error: `[ERROR] ${err.message}\r\n`, stationId })
+        this.lineConnecting = this.lineConnecting.filter((el) => el !== lineId)
+        io.emit('line_error', { lineId, error: `\n[ERROR] ${err.message}\n`, stationId })
       }
     }
   }