Created Unassigned: Item has already been added. Key in dictionary: 'Admin' Key being added: 'Admin' [196]

On a clean installation of BugNET 1.5.265 with SQLEXPRESS 2008 r2 (clean database):

__http://localhost/Administration/Users/UserList.aspx__
```
Server Error in '/' Application.

Item has already been added. Key in dictionary: 'Admin' Key being added: 'Admin'

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Item has already been added. Key in dictionary: 'Admin' Key being added: 'Admin'

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[ArgumentException: Item has already been added. Key in dictionary: 'Admin' Key being added: 'Admin']
System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +14403121
System.Web.Security.MembershipUserCollection.Add(MembershipUser user) +15173
System.Web.Providers.DefaultMembershipProvider.FindUsersByName(String usernameToMatch, Int32 pageIndex, Int32 pageSize, Int32& totalRecords) +618
BugNET.Providers.MembershipProviders.ExtendedSqlMembershipProvider.FindUsersByName(String usernameToMatch, Int32 pageIndex, Int32 pageSize, Int32& totalRecords) +112
System.Web.Security.Membership.FindUsersByName(String usernameToMatch) +203
BugNET.BLL.UserManager.FindUsersByName(String userNameToMatch) +85
BugNET.Administration.Users.UserList.BindData(String filter) +229
BugNET.UserInterfaceLayer.BasePage.OnLoad(EventArgs e) +92
System.Web.UI.Control.LoadRecursive() +71
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3178
```