execute custom procedure

Hello,

I'm trying to execute a custom procedure with three parameters given from productvariant model, but when I'm executing
ExecuteStoredProcedureList entity this error occurs:

New transaction is not allowed because there are other threads running in the session.
It is on EfRepository line 41 this._context.SaveChanges();

Could anyonne help me on this?

Should I create a new Entity and if so, how I can do it?

I'm running nop 2.3

Thanks in advance.