diff --git a/server/src/lib/wifiDevices.js b/server/src/lib/wifiDevices.js
index fafa8c7..7badcd9 100644
--- a/server/src/lib/wifiDevices.js
+++ b/server/src/lib/wifiDevices.js
@@ -77,7 +77,7 @@ async function forceUserDisconnect(mac) {
 }
 
 function mockHostName({ mac, oui }) {
-  const shortOui = oui ? oui.split(' ')[0] : ''
+  const shortOui = oui?.split(' ')[0] || 'desc'
   const clearMac = mac ? mac.replaceAll(':', '') : ''
 
   return `${shortOui}_${clearMac}`
@@ -86,10 +86,13 @@ function mockHostName({ mac, oui }) {
 async function updateDB(onlineDevices) {
   const upsertPromises = onlineDevices.map(async device => {
     if (!device.user) forceUserDisconnect(device.mac)
-    else device.user = device.user.replace('IFMS\\', '')
 
     const user = device.user
-      ? { connect: { sAMAccountName: device.user.toLowerCase() } }
+      ? {
+          connect: {
+            sAMAccountName: device.user.replace('IFMS\\', '').toLowerCase()
+          }
+        }
       : undefined
 
     const hostname = device.hostname || mockHostName(device)