How can I resolved error an Object reference not set to an instance of an object.

Question

I am getting am Object reference not set to an instance of an object when I try to Run a Azure PowerShell Function to connect to Azure SQL Managed Instance. Anyone have any suggestions?

Answer 1

Her is my requirements.psd1

# This file enables modules to be automatically managed by the Functions service.
# See https://aka.ms/functionsmanageddependency for additional information.
#
@{
    # For latest supported version, go to 'https://www.powershellgallery.com/packages/Az'. 
    # To use the Az module in your function app, please uncomment the line below.
    'Az' = '9.*'
  
}	

Here is my profile.pds1

Azure Functions profile.ps1
#
# This profile.ps1 will get executed every "cold start" of your Function App.
# "cold start" occurs when:
#
# * A Function App starts up for the very first time
# * A Function App starts up after being de-allocated due to inactivity
#
# You can define helper functions, run commands, or specify environment variables
# NOTE: any variables defined that are not environment variables will get reset after the first execution

# Authenticate with Azure PowerShell using MSI.
# Remove this if you are not planning on using MSI or Azure PowerShell.
if ($env:MSI_SECRET) {
    Disable-AzContextAutosave -Scope Process | Out-Null
    Connect-AzAccount -Identity
}
# Uncomment the next line to enable legacy AzureRm alias in Azure PowerShell.
# Enable-AzureRmAlias

# You can also define functions or aliases that can be referenced in any of your PowerShell functions.

Here is my error message
2024-05-24T12:57:31Z [Error] ERROR: Object reference not set to an instance of an object. Exception : Type : System.NullReferenceException TargetSite : Name : GetEntity DeclaringType : Microsoft.Azure.Commands.Sql.ManagedDatabase.Cmdlet.RestoreAzureRmSqlManagedDatabase MemberType : Method Module : Microsoft.Azure.PowerShell.Cmdlets.Sql.dll Message : Object reference not set to an instance of an object. Source : Microsoft.Azure.PowerShell.Cmdlets.Sql HResult : -2147467261 StackTrace : at Microsoft.Azure.Commands.Sql.ManagedDatabase.Cmdlet.RestoreAzureRmSqlManagedDatabase.GetEntity() at Microsoft.Azure.Commands.Sql.Common.AzureSqlCmdletBase`2.ExecuteCmdlet() at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.<>c__3`1.<ExecuteSynchronouslyOrAsJob>b__3_0(T c) at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.ExecuteSynchronouslyOrAsJob[T](T cmdlet, Action`1 executor) at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.ExecuteSynchronouslyOrAsJob[T](T cmdlet) at Microsoft.WindowsAzure.Commands.Utilities.Common.AzurePSCmdlet.ProcessRecord() CategoryInfo : CloseError: (:) [Restore-AzSqlInstanceDatabase], NullReferenceException FullyQualifiedErrorId : Microsoft.Azure.Commands.Sql.ManagedDatabase.Cmdlet.RestoreAzureRmSqlManagedDatabase InvocationInfo : MyCommand : Restore-AzSqlInstanceDatabase ScriptLineNumber : 26 OffsetInLine : 1 HistoryId : 1 ScriptName : C:\home\site\wwwroot\Aspen_RO_Copy\run.ps1 Line : Restore-AzSqlInstanceDatabase -FromPointInTimeBackup -ResourceGroupName $resourceGroup -InstanceName $managedInstance -Name $database -PointInTime $pointInTime -TargetInstanceDatabaseName $targetDatabase ` PositionMessage : At C:\home\site\wwwroot\Aspen_RO_Copy\run.ps1:26 char:1

Answer 2

Hello Shields, Timothy,

Thanks for your question.

The message "object reference not set to an instance of an object" means that you are referring to an object that's null or an Azure resource that doesn't exist or that you don't have permissions to access.

The Object reference error is also thrown if you forget to run Connect-AzAccount

I will recommend you run Connect-Azaccount and try to check if the object pointed to exists using:
Get-AzResource -ResourceId $resourceId

The command above will tell you the object in question:

This is an Azure Powershell error documented here:

https://learn.microsoft.com/en-us/powershell/azure/troubleshooting?view=azps-11.6.0#object-reference-not-set-to-an-instance-of-an-object

Please let me know if you have further questions

You can mark it 'Accept Answer' if this helped.

Answer 3

Hi there Shields, Timothy

Thanks for using QandA platform

this error can happen for several reasons.

try these:

1. make sure that all variables and objects are properly initialized before you attempt to use them. including the Azure SQL Managed Instance connection objects.
2. Make sure your connection string is correctly formatted and that it contains all the necessary information (server name, database name, user credentials, etc.).
3. finally make sure that you have the necessary Azure PowerShell modules installed and imported in your script.

Use these commands to instal the modules

Install-Module -Name Az -AllowClobber -Force
Import-Module -Name Az

If this helps kindly accept the answer thanks much.