Azure Functions - New-AzContainerGroup : Object reference not set to an instance of an object - azure

Question

I've been trying to create Azure Container instance using http triggered powershell Azure Function.
I've wrote some code and it works... kind of
using namespace System.Net
param($Request, $TriggerMetadata)
$appId = "appID"
$appPassword = "appPassword"
$secpasswd = ConvertTo-SecureString $appPassword -AsPlainText -Force
$mycred = New-Object System.Management.Automation.PSCredential ($appId, $secpasswd)
$status = [HttpStatusCode]::OK
New-AzContainerGroup -ResourceGroupName "test" -Name "testName" `
-Image "imageName" `
-RegistryCredential $mycred `
-RestartPolicy Never
Push-OutputBinding -Name Response -Value ([HttpResponseContext]#{
StatusCode = $status
Body = $body
})
When i hit endpoint, i always get 500 response code, but for some reason container instance is being created anyway and it works. Here's error from terminal:
Executed 'Functions.testFuntion' (Failed, Id=240084c5-6aa2-4207-ae84-66f85a03504b)
System.Private.CoreLib: Exception while executing function: Functions.testFuntion.
System.Private.CoreLib: Result: Failure
Exception: Object reference not set to an instance of an object.
Stack:
at
Microsoft.Azure.Functions.PowerShellWorker.Utility.TypeExtensions.
DeriveContentType(HttpResponseContext
Microsoft.Azure.Functions.PowerShellWorker.Utility.TypeExtensions.DeriveContentType
(HttpResponseContext httpResponseContext, RpcHttp rpcHttp) in C:\projects\azure-functions-powershell-
worker\src\Utility\TypeExtensions.cs:line 196
at
Microsoft.Azure.Functions.PowerShellWorker.Utility.TypeExtensions.ToRpcHttp(HttpResponseContext
httpResponseContext) in C:\projects\azure-functions-powershell-
worker\src\Utility\TypeExtensions.cs:line 188
at
Microsoft.Azure.Functions.PowerShellWorker.Utility.TypeExtensions.ToTypedData(Object value) in
C:\projects\azure-functions-powershell-worker\src\Utility\TypeExtensions.cs:line 242
at
Microsoft.Azure.Functions.PowerShellWorker.RequestProcessor.BindOutputFromResult(InvocationResponse
response, AzFunctionInfo functionInfo, Hashtable results) in C:\projects\azure-functions-powershell-
worker\src\RequestProcessor.cs:line 465
at
Microsoft.Azure.Functions.PowerShellWorker.RequestProcessor.ProcessInvocationRequestImpl
(StreamingMessage request, AzFunctionInfo functionInfo, PowerShellManager psManager,
FunctionInvocationPerformanceStopwatch stopwatch)
in C:\projects\azure-functions-powershell-worker\src\RequestProcessor.cs:line 305.
Is this something i should be worried about? Even though i get 500 response, everything seems to be working.

Answer 1

You may need to define $body before using it in the Push-OutputBinding response.
Something like:
$body = "My Message"
Push-OutputBinding -Name Response -Value ([HttpResponseContext]#{
StatusCode = $status
Body = $body
})