Network Management

“An error occurred. Nullable object must have a value." message when accessing the Servers and Pool tab after upgrading to SolarWinds Platform 2025.2

This article provides information about an issue where the Servers and Pools tab under My Deployment Page does not load properly and produces an error message of "An error occurred. Nullable object must have a value.". This occurs after upgrading to SolarWinds Platform 2025.2.

First published date

7/7/2025 11:28 PM

Last published date

1/6/2026 6:25 PM

Overview

Starting SolarWinds Platform 2025.2, the High Availability (HA) tab was migrated to two separate tabs called Server and Pools.  For more information about these changes, please reference the SolarWinds Platform 2025.2 release notes.

After upgrading to SolarWinds Platform 2025.2, the following error message appears when navigating to Servers or Pools tab under My Deployment:

An error occurred. Nullable object must have a value.

 

The observed symptoms includes:

  • Navigating to Servers tab results in a blank page with the above error message.
  • Navigating to Pools tab results in a blank page with the above error message.

Product section

Orion Platform

Cause

This issue occurs due to additional requirements in SolarWinds Platform 2025.2, which now mandate that the servers be explicitly monitored as nodes. By default, SolarWinds servers are automatically monitored upon deployment through agent-based polling during installation.

If the agent is removed, the SolarWinds server is removed as a monitored node to free up license elements, causing the NodeId to be set to NULL in the OrionServers table.

Resolution

Use either Method 1 OR Method 2 to update the NodeID of the SolarWinds Server on the OrionServers table.

Method 1: Add the SolarWinds Platform server as a node via Agent, WMI, or ICMP.

  • Add the SolarWinds Platform server as a node via Agent, WMI, or ICMP.

 

Method 2: Manually Update NodeID via Database Manager 

If the SolarWinds Platform server has been added already as a Node and does not reflect in the table, update the NodeID manually via Database Manager.

  1. Connect to the SolarWinds Platform server.
  2. Open Database Manager from the SolarWinds Platform folder in the Start menu.
  3. Select Add Orion Server, and expand the SQL server and database in bold.
  4. Navigate to the OrionServers table and double-click. A query window opens on the right.
  5. Click Execute query to display the top 1,000 rows.
  6. Click Enable table editing
  7. Find the row where the NodeID column is NULL. 
  8. Enter the correct NodeID for the server with a Null value in the column
  9. Press Enter
  10. Click Execute query again to confirm the value is updated in the database.