Getting Exception Report - Pointing Bit Of Code

It doesn't happen often but from time to time I'll get an exception report emailed to me pointing to this bit of code. I'm wondering if you see anything wrong with it:

Csharp Code:
namespace DomainModel.Concrete
{
public class ConfigRepository : IConfigRepository
static mvCmsContext context { get; set; }
public ConfigRepository() { context = new mvCmsContext(); }
private static Func<mvCmsContext, string, Configuration> _byName =
CompiledQuery.Compile((mvCmsContext context, string configName) =>.........................