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Evaluation of condition failed. Rule item ID: Unknown, condition item ID: Unknown - Operation is not valid due to the current state of the object

I am reviewing the Sitecore logs for my site, and I am getting the following error more than 10,000 times per week:

ERROR Evaluation of condition failed. Rule item ID: Unknown, condition item ID: Unknown
Exception: System.InvalidOperationException
Message: Operation is not valid due to the current state of the object.
Source: Sitecore.ExperienceAnalytics
   at Sitecore.ExperienceAnalytics.Aggregation.Rules.AggregationAdaptor.HistoricalVisitContextBase.GetPages()
   at Sitecore.Analytics.Rules.Conditions.HasVisitedPageCondition`1.Execute(T ruleContext)
   at Sitecore.Rules.Conditions.WhenCondition`1.Evaluate(T ruleContext......

I don't know what is causing this and I'm not sure how to find that out or where to even start. I would like to resolve the issue so that I don't have so many errors being thrown constantly. Any help is appreciated.

Thanks,
Erica