I keep getting an InvalidProgramException trying to grab data through the entity framework. using

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Asked: June 1, 20262026-06-01T12:08:30+00:00 2026-06-01T12:08:30+00:00

I keep getting an InvalidProgramException trying to grab data through the entity framework. using

0

I keep getting an InvalidProgramException trying to grab data through the entity framework.

using (var db = new Entities())
{
    var utrs = from u in db.users_to_roles
               select u; // utrs.Count() > 1 at this point. So, there IS data!

    users_to_roles utr = utrs.FirstOrDefault(); // InvalidProgramException!
    utrs.GetEnumerator(); // InvalidProgramException!
    utrs.ToList(); // InvalidProgramException!
}

The table is simple:

CREATE TABLE `users_to_roles` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `userid` bigint(20) NOT NULL,
  `roleid` bigint(20) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `fkuserid` (`userid`),
  KEY `FK22FCE45052C7D0B5` (`roleid`),
)

I don’t have this problem with other tables. What am I missing?

Exception: System.InvalidProgramException – “Common Language Runtime detected an invalid program.”

Stack Trace:

 at System.Data.Entity.DynamicProxies.users_to_roles_026CF8D248576FA69379B3C621F372FAF9B6F2E4794C8490AE27BABE54609FF1.set_id(Decimal )
       at lambda_method(Closure , Shaper )
       at System.Data.Common.Internal.Materialization.Shaper.HandleEntityAppendOnly[TEntity](Func`2 constructEntityDelegate, EntityKey entityKey, EntitySet entitySet)
       at lambda_method(Closure , Shaper )
       at System.Data.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper)
       at System.Data.Common.Internal.Materialization.Shaper`1.SimpleEnumerator.MoveNext()
       at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
       at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
       at Users.Lib.DAOs.Mysql.MysqlUserDAO.RemoveRoleFromUser(String email, String roleName) in C:\Work\Users.Lib\DAOs\Mysql\MysqlUserDAO.cs:line 242

Edit

Solution, thanks to @Quintin below. The ‘id’ column in my entities was mapped to a decimal instead of an Int64. Not sure how it got this way, but problem is solved!