diff --git a/app.py b/app.py
index b36029a..fd46304 100644
--- a/app.py
+++ b/app.py
@@ -760,7 +760,8 @@ def find_uid_number(conf, conn):
         uidNumbersList=[]
         for i in conn.response:
             uidNumbersList.append(i['attributes']['uidNumber'])
-
+            
+        uidNumbersList = list(filter(lambda i: type(i) is int, uidNumbersList))
         return max(uidNumbersList)
 
     else: