In my site admin-> Event log i found this error, can you guys help me how to fix this issue. It keeps generating more often

ModuleId: -1

ModuleDefId: -1

FriendlyName:

ModuleControlSource: DesktopModules/Admin/Security/ManageUsers.ascx

AssemblyVersion: 7.0.6

PortalID: 0

PortalName: boardrepairs.net

UserID: -1

UserName:

ActiveTabID: 58

ActiveTabName: Home

RawURL: /?ctl=profile&userId=&pageno=3

AbsoluteURL: /Default.aspx

AbsoluteURLReferrer: http://www.boardrepairs.net/?ctl=profile

UserAgent: Mozilla/5.0 (Windows NT 5.1; rv:35.0) Gecko/20100101 Firefox/35.0

DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID: 77f7e492-ae97-4a10-a9ea-6d9e29bda9d4

InnerException: Input string was not in a correct format.

FileName:

FileLineNumber: 0

FileColumnNumber: 0

Method: System.Number.StringToNumber

StackTrace:

Message: DotNetNuke.Services.Exceptions.ModuleLoadException: Input string was not in a correct format. ---> System.FormatException: Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at DotNetNuke.Entities.Modules.UserModuleBase.get_UserId() at DotNetNuke.Entities.Modules.UserModuleBase.get_AddUser() at DotNetNuke.Entities.Modules.UserModuleBase.get_User() at DotNetNuke.Modules.Admin.Users.ManageUsers.BindData() at DotNetNuke.Modules.Admin.Users.ManageUsers. (EventArgs e) --- End of inner exception stack trace ---

Source:

Server Name: XYZ