diff --git a/models/GpsTracksModels.js b/models/GpsTracksModels.js
index 5a74afa..d5f72c7 100755
--- a/models/GpsTracksModels.js
+++ b/models/GpsTracksModels.js
@@ -394,8 +394,9 @@ class GpsTracksModels {
 	static bundleCreate2(logs = {}, rltm = {}) {
 		return new Promise(async (resolve, reject) => {
 			let lock = null
+			let conn = null
 			try {
-				const conn = await MysqlHelpers.createConnection()
+				conn = await MysqlHelpers.createConnection()
 				await MysqlHelpers.createTrx(conn)
 
 				let rltmLength = Object.keys(rltm).length
@@ -529,7 +530,7 @@ class GpsTracksModels {
 						console.log("ERROR unlock mutex : " + rltm.device_id, unlockErr)
 					}
 				}
-				// conn.release(); // release connection
+				conn.release(); // release connection
 			}
 		})
 	}