Event ID 1309 & 5011/13 on the front server !

Hi,
We are using SharePoint 2010 SP1 (four servers) two front & two application
The following Event ID is showing up every 30 to 60 minutes  
Appreciate guide steps
where to look !
Event
Details #
Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 4/8/2014 11:43:18 AM 
Event time (UTC): 4/8/2014 9:43:18 AM 
Event ID: 18be35268d3d4e99b17def4ed0d15405 
Event sequence: 51306 
Event occurrence: 9 
Event detail code: 0 
Application information: 
    Application domain: /LM/W3SVC/665984781/ROOT-1-130414199691539304 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: C:\inetpub\wwwroot\wss\VirtualDirectories\80\ 
    Machine name: SP-01 
Process information: 
    Process ID: 23944 
    Process name: w3wp.exe 
    Account name: Domain\SPAdmin 
Exception information: 
    Exception type: InvalidOperationException 
    Exception message: Nullable object must have a value. 
Request information: 
    Request URL: http://www.DomainName.com/sites/DataEntryView/KPIManagement/Pages/ListUserMetrics.aspx 
    Request path: /sites/DataEntryView/KPIManagement/Pages/ListUserMetrics.aspx 
    User host address: 41.33.186.163 
    User: Domain\HPOVDE 
    Is authenticated: True 
    Authentication Type: NTLM 
    Thread account name: Domain\SPAdmin 
Thread information: 
    Thread ID: 34 
    Thread account name: Domain\SPAdmin 
    Is impersonating: False 
    Stack trace:    at System.Nullable`1.get_Value()
   at ITWorx.PMF.KPIManagement.SharePoint.WebParts.ListUserMetrics.ListUserMetricsUserControl.btnFitler_Click(Object
sender, EventArgs e)
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Custom event details: 

Hi,
According to your description, my understanding is that the errors occurred in SharePoint 2010.
From the error message, the request URL is
http://www.DomainName.com/sites/DataEntryView/KPIManagement/Pages/ListUserMetrics.aspx.
What does the URL refer to in SharePoint?
I recommend to check if there is a Nullable type filed that had been made without checking to see if it had a value in your custom code or if a mandatory field was not filled with value in the link above.
http://ala-shanti.blogspot.com/2012/01/test.html
For Event ID 5011 and 5013, please follow the links below to troubleshoot the issue:
http://technet.microsoft.com/en-us/library/cc735271(v=ws.10).aspx
http://technet.microsoft.com/en-us/library/cc735024(v=ws.10).aspx
Best regards.
Thanks
Victoria Xia
TechNet Community Support

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