Returning AspNetUser table data from get request

I am using Asp.Net Web Api Identity - Individual User Account. I am returning AspNetUser Table Data from Web API.
Note : This table is made my asp.net itself, not me. But, I changed its connection string to store it in a pre-exiting database in Sql, and now, returning table data causes Internal Server Error.

Internal Server Error

public AspNetUser Get(string id)
{
using (UserDBEntities entities = new UserDBEntities())
{
return entities.AspNetUsers.FirstOrDefault(u => u.UserName == id);
}
}


And class for AspNetUser table is default, as individual user account proposes.

If I do it like below, error still persist on normal run, but not while debugging, that is when I debug the code step-by-step, it works file, and returns correct data, but when I remove my breakpoints and execute OR press continue while debugging instead of going step wise to return statement, it runs into error.

AspNetUser data = entities.AspNetUsers.FirstOrDefault(u => u.UserName == id);
return data;


Unlike this scenario, Returning without storing data, runs into error in all cases (debugging or not).

But, I don't understand, why??
how come this can affect anyhow?

Network Error Response Body:=>

{"Message":"An error has occurred.","ExceptionMessage":"The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; charset=utf-8'.","ExceptionType":"System.InvalidOperationException","StackTrace":null,"InnerException":{"Message":"An error has occurred.","ExceptionMessage":"Error getting value from 'AspNetUserClaims' on 'System.Data.Entity.DynamicProxies.AspNetUser_4C1FDBB9E07016D6C527FBA4F5785F2C7FE37C77A86A5D1946B99CFFDE56DB7F'.","ExceptionType":"Newtonsoft.Json.JsonSerializationException","StackTrace":" at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue(Object target)rn at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue)rn at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)rn at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)rn at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)rn at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)rn at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, Encoding effectiveEncoding)rn at System.Net.Http.Formatting.JsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, Encoding effectiveEncoding)rn at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content)rn at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)rn--- End of stack trace from previous location where exception was thrown ---rn at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)rn at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)rn at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__22.MoveNext()","InnerException":{"Message":"An error has occurred.","ExceptionMessage":"The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.","ExceptionType":"System.ObjectDisposedException","StackTrace":" at System.Data.Entity.Core.Objects.ObjectContext.get_Connection()rn at System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)rn at System.Data.Entity.Core.Objects.ObjectQuery`1.Execute(MergeOption mergeOption)rn at System.Data.Entity.Core.Objects.DataClasses.EntityCollection`1.Load(List`1 collection, MergeOption mergeOption)rn at System.Data.Entity.Core.Objects.DataClasses.EntityCollection`1.Load(MergeOption mergeOption)rn at System.Data.Entity.Core.Objects.DataClasses.RelatedEnd.DeferredLoad()rn at System.Data.Entity.Core.Objects.Internal.LazyLoadBehavior.LoadProperty[TItem](TItem propertyValue, String relationshipName, String targetRoleName, Boolean mustBeNull, Object wrapperObject)rn at System.Data.Entity.Core.Objects.Internal.LazyLoadBehavior.<>c__DisplayClass7`2.<GetInterceptorDelegate>b__1(TProxy proxy, TItem item)rn at System.Data.Entity.DynamicProxies.AspNetUser_4C1FDBB9E07016D6C527FBA4F5785F2C7FE37C77A86A5D1946B99CFFDE56DB7F.get_AspNetUserClaims()rn at GetAspNetUserClaims(Object )rn at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue(Object target)"}}}


I want to know the reason of this anomaly, not any solution, because it can be solved by returning a defined class, Like this =>

User user = new User();
AspNetUser data = entities.AspNetUsers.FirstOrDefault(u => u.UserName == id);
user.reg_username = data.UserName;
user.reg_email = data.Email;
return user;


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