I have 10 list items in a SharePoint 2013 list and there are 3 workflows associated with the content type of those list items. All 3 of them have a conditional start for new created items, based on the value of a column.
When monitoring the ULS, I find 163 identical errors. All of them are like this:
09/22/2014 16:10:16.90 OWSTIMER.EXE (0x2B20) 0x05A0 Nintex Workflow 2013 General 00000 Unexpected Error processing item updated event.: System.ArgumentNullException: Value cannot be null. Parameter name: s at System.IO.StringReader..ctor(String s) at Nintex.Workflow.PreviousValueRecordCollection.nxk=(String oBk=) at Nintex.Workflow.ConditionalWorkflowStartReceiver.kBk=(SPItemEventProperties kRk=, AutoStartRuleType khk=, Boolean kxk=) at Nintex.Workflow.ConditionalWorkflowStartReceiver.ItemUpdated(SPItemEventProperties properties) (Build:3080) f7fdba9c-8e28-c0b5-dbb7-a7a8cf1862d5
The workflows don't appear to be suffering from this since they just run fine. But I'm interested to know what these errors are about and if they can be avoided.