diff --git a/server/src/utils/wifiUtils.js b/server/src/utils/wifiUtils.js
index bc9c1a7..82e04c8 100644
--- a/server/src/utils/wifiUtils.js
+++ b/server/src/utils/wifiUtils.js
@@ -40,7 +40,7 @@ async function updateDBWithOnlineDevices() {
       try {
         await prisma.wifiDevice.upsert({
           where: { mac: onlineDevice.mac },
-          create: device,
+          create: { ...device, firstSeen: device.firstSeen || new Date() },
           update: device
         })
       } catch (e) {