Error while creating records in CRM 2013

Hi Team,

When tried to create new records one by one in CRM 2013 (OnPrem) using plugin, getting below mentioned exception in 5 out of 10 records due to which these records are not getting created. 

For code analysis I have put logger in plugin, each step get executed successfully but when it comes to Create() method of CRM it throws below exception.

Microsoft.Crm.Extensibility.InprocessServiceProxy Microsoft.Crm.Workflow.SynchronousRuntime.SynchronousWorkflowContext        
at Microsoft.Crm.Extensibility.OrganizationSdkServiceInternal.Create(Entity entity, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType, Boolean checkAdminMode)
 at Microsoft.Crm.Extensibility.InprocessServiceProxy.CreateCore(Entity entity)

Kindly suggest how to tackle this exception.