Hello, 

I am experiencing a ton of these errors. I recently upgraded to DNN 7.3.3 to see if it helped, but it has not. I get 1 every minute and my Event Viewer is full of them. 

AssemblyVersion:7.3.3

PortalID:-1

PortalName:

UserID:-1

UserName:

ActiveTabID:-1

ActiveTabName:

RawURL:

AbsoluteURL:

AbsoluteURLReferrer:

UserAgent:

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:a2c0cd35-3d26-4031-b69c-0c6a252558b7

InnerException:Object cannot be cast from DBNull to other types.

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:System.DBNull.System.IConvertible.ToDateTime

StackTrace:

Message:

System.InvalidCastException: Object cannot be cast from DBNull to other types.

at System.DBNull.System.IConvertible.ToDateTime(IFormatProvider provider)

at DotNetNuke.Services.Search.UserIndexer.GetSearchDocuments(Int32 portalId, DateTime startDate)

Source:

Server Name: