Powershell Error from client

Hi,

I am getting an error from the client when it successfully connects back to my listener ive pasted some output below;

##Listener Sucessfully Running

Octopus >>listeners

Name       IP         Port  Host              Interval  Path      SSL
---------  -------  ------  --------------  ----------  --------  -----
listener1  0.0.0.0      80  192.168.80.129           5  page.php  False

##Session Started on target

  Session  IP            Hostname           Process Name / PID / Arch    Username    Domain     Last ping                 OS
---------  ------------  -----------------  ---------------------------  ----------  ---------  ------------------------  --------------------------------
        2  192.168.80.1  TestHost-PWYVI  powershell (21060) - x64     test*   WORKGROUP  Thu Nov 12 11:30:11 2020  Microsoft Windows 10 Pro(64-bit)

##Error Received each time host checks in

Octopus >>
Command execution result is :
Invoke-Expression : Cannot bind argument to parameter 'Command' because it is an empty string.
At line:144 char:33
+         $ec = Invoke-Expression ($fc) | Out-String;
+                                 ~~~~~
    + CategoryInfo          : InvalidData: (:) [Invoke-Expression], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorEmptyStringNotAllowed,Microsoft.PowerShell.Commands.Invo
   keExpressionCommand

I have tried several different generation methods each with the same results, I have turned AV off but still the same error.

Please could you assist?

Start by reproducing the PowerShell client check-in against the listener configuration shown in the report, then inspect the generated client around line 144 where Invoke-Expression receives $fc. The issue is resolved when repeated check-ins no longer produce the empty-command error.