Error "System.ArgumentOutOfRangeException" when clicking on SQL Server Agent on object explorer (4304455)

When i connect to a SQL Express instance, and click on 'SQL Server Agent' in the Object Explorer, it pauses, then throws up many many overlapping windows saying:

System.ArgumentOutOfRangeException
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Stack Trace:
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at System.ThrowHelper.ThrowArgumentOutOfRangeException()
at System.Collections.Generic.List`1.get_Item(Int32 index)
at Quest.FastData.FastTable.RowCollection.get_Item(Int32 index)
at Quest.FastData.FastTable.System.Collections.IList.get_Item(Int32 index)
at Quest.FastData.FastRowCollection.get_Item(Int32 index)
at Quest.Toad.SqlServer.Trl.AgentProperties.SqlAgentPropertiesTrl.get_AgentStatus()
at Quest.Toad.SqlServer.Doe.Action.ActionEditForm.AgentStopIdle(BarItem item)

SQL Express does not have a SQL Server Agent, but this button was clicked in error