diff --git a/mesh_bot.py b/mesh_bot.py
index 42f20dc..aab37be 100755
--- a/mesh_bot.py
+++ b/mesh_bot.py
@@ -1153,7 +1153,7 @@ def sysinfo(message, message_from_id, deviceID):
         if enable_runShellCmd and file_monitor_enabled:
             # get the system information from the shell script
             # this is an example of how to run a shell script and return the data
-            shellData = call_external_script(None, "script/sysEnv.sh")
+            shellData = call_external_script('', "script/sysEnv.sh")
             # check if the script returned data
             if shellData == "" or shellData == None:
                 # no data returned from the script