gistfile1.cs

Exception:

System.NullReferenceException: Object reference not set to an instance of an object
  at System.Array.Copy (System.Array sourceArray, Int32 sourceIndex, System.Array destinationArray, Int32 destinationIndex, Int32 length) [0x00000] in <filename unknown>:0 
  at System.Collections.ArrayList.CopyTo (Int32 index, System.Array array, Int32 arrayIndex, Int32 count) [0x00000] in <filename unknown>:0 
  at System.Collections.ArrayList.CopyTo (System.Array array, Int32 arrayIndex) [0x00000] in <filename unknown>:0 
  at System.MonoCustomAttrs.GetCustomAttributes (ICustomAttributeProvider obj, System.Type attributeType, Boolean inherit) [0x00000] in <filename unknown>:0 
  at System.MonoType.GetCustomAttributes (System.Type attributeType, Boolean inherit) [0x00000] in <filename unknown>:0 
  at ServiceStack.Common.ReflectionExtensions.FirstAttribute[AliasAttribute] (System.Type type, Boolean inherit) [0x00000] in <filename unknown>:0 
  at ServiceStack.Common.ReflectionExtensions.FirstAttribute[AliasAttribute] (System.Type type) [0x00000] in <filename unknown>:0 
  at ServiceStack.Common.Extensions.ReflectionExtensions.FirstAttribute[AliasAttribute] (System.Type type) [0x00000] in <filename unknown>:0 
  at ServiceStack.OrmLite.OrmLiteConfigExtensions.GetModelDefinition (System.Type modelType) [0x00000] in <filename unknown>:0 
  at ServiceStack.OrmLite.OrmLiteDialectProviderBase`1[ServiceStack.OrmLite.PostgreSQL.PostgreSQLDialectProvider].ToSelectStatement (System.Type tableType, System.String sqlFilter, System.Object[] filterParams) [0x00000] in <filename un
known>:0 
  at ServiceStack.OrmLite.OrmLiteReadExtensions.GetFilterSql[PollerEntity] (IDbCommand dbCmd) [0x00000] in <filename unknown>:0 
  at ServiceStack.OrmLite.OrmLiteReadExtensions.SetFilters[PollerEntity] (IDbCommand dbCmd, System.Object anonType, Boolean excludeNulls) [0x00000] in <filename unknown>:0 
  at ServiceStack.OrmLite.OrmLiteReadExtensions.QuerySingle[PollerEntity] (IDbCommand dbCmd, System.Object anonType) [0x00000] in <filename unknown>:0 
  at Mosaic.Poller.Daemon.MainClass+<OnCheckInPerfDataRequest>c__AnonStorey2.<>m__4 () [0x00068] in /Users/ahall/Projects/mosaic-backend/src/Mosaic.Poller.Daemon/Main.cs:304 


What I'm doing is running the following code inside a task which end up being executed concurrently:
    using (var dbConn = mosaicDbFactory.OpenDbConnection())
    using (var dbCmd = dbConn.CreateCommand())
    using (var transaction = dbCmd.BeginTransaction())
    {
        var poller = dbCmd.QuerySingle<PollerEntity>(new { common_name = commonName });
        ...
    }

Its crashing on the QuerySingle() statement but only if its being executed by multiple tasks at the same time by the looks of it.