Intune Uninstall Error

Hoping someone can help me with this issue?

I am having an issue uninstalling a Win32 app deployed from Intune. The installation works fine but whenever I try and un-install from Company portal I get an error saying uninstall failed. 

I believe the .msi uninstall command in Intune is correct and it works fine if I run in command prompt as admin. The detection rules are right as its updating the installation install status in Intune. 

Looking through the Intune logs, I keep getting this when I try to run uninstall 

"GetRegistryValue encountered an exception: System.NullReferenceException: Object reference not set to an instance of an object.at Microsoft.Management.Services.IntuneWindowsAgent.AgentCommon.RegistryHelper.GetRegistryValue(String key, String valueName, String defaultValue, Boolean check32BitOn64)"

The application was a msi and packed up as a intunewin file. 

Any help would be great