diff --git a/src/controllers/installationController.js b/src/controllers/installationController.js
index 72c9dcb4..e37f067b 100644
--- a/src/controllers/installationController.js
+++ b/src/controllers/installationController.js
@@ -2486,7 +2486,7 @@ exports.getIotDataByCustomer = async (req, reply) => {
 
       // ✅ Prepare tank info
       const tanks = connectedSlaves.map(slave => {
-        const slaveId = slave.hardwareId?.trim();
+        const slaveId = slave.tankhardwareId?.trim();
         const matchedTank = latestRecord.tanks?.find(t => t.tankhardwareId === slaveId);
 
         let loraMessage = "LORA is not connected";