diff --git a/zabbix-agent-scripts/get_apache2_user_agent_metrics.py b/zabbix-agent-scripts/get_apache2_user_agent_metrics.py
index 983f4db..20cc2d7 100644
--- a/zabbix-agent-scripts/get_apache2_user_agent_metrics.py
+++ b/zabbix-agent-scripts/get_apache2_user_agent_metrics.py
@@ -15,6 +15,8 @@
                  parse_dates=["timestamp"]
                 )
 
+df.fillna("not-found",inplace=True)
+
 ## EDGE
 # Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36 Edg/110.0.1587.57
 ## Chrome
@@ -31,45 +33,45 @@
     ## Nextcloud Talk App
     if "nextcloud-talk" in s:
         if "android" in s:
-            return "Nextcloud_Talk_Android"
+            return "nextcloud_talk_android"
         elif "ios" in s:
-            return "Nextcloud_Talk_iOS"
+            return "nextcloud_talk_ios"
         else:
-            return "Nextcloud_Talk_unknown"
+            return "nextcloud_talk_unknown"
     
     ## Nextcloud Files App
     if "nextcloud-android" in s:
-        return "Nextcloud_Android"
+        return "nextcloud_android"
     
     ## Browser
     if "chrome" in s:
         if "edg" in s:
-            return "Edge_browser"
+            return "edge_browser"
         else:
-            return "Chrome_browser"
+            return "chrome_browser"
     if "firefox" in s:
-        return "Firefox_browser"
+        return "firefox_browser"
     if "macintosh" in s and "applewebkit" in s:
-        return "Safari_browser"
+        return "safari_browser"
     
     ## Desktop Client
     if "mirall" in s:
         if "linux" in s:
-            return "Desktop_Client_Linux"
+            return "desktop_client_linux"
         elif "macintosh" in s:
-            return "Desktop_Client_Mac"
+            return "desktop_client_mac"
         elif "windows" in s:
-            return "Desktop_Client_Windows"
+            return "desktop_client_windows"
         else:
-            return "Desktop_Client_Unknown"
+            return "desktop_client_unknown"
     
     ## DavX5, CardDAV / CalDAV sync agent on Android
     if "davx5" in s:
-        return "DavX5"
+        return "davx5"
     
     ## Thunderbird, CardDAV / CalDAV sync agent on Desktop
     if "thunderbird" in s:
-        return "Thunderbird"
+        return "thunderbird"
     
     ## Python scripting
     if "python" in s: