Lookup with full cache warning

I am using a lookup and full cache, occasionally i get this warning:

[Lookup [150]] Warning: The component "Lookup" (150) encountered duplicate reference key values when caching reference data. This error occurs in Full Cache mode only. Either remove the duplicate key values, or change the cache mode to PARTIAL or NO_CACHE.

Now I know it is only a warning but it is highlighting a real issue.

Is there a way of capturing that this has happened?