[xwiki-users] Exceptions on save?

Using Xwiki 1.2; I get the following quite often on a fair chunk of documents across my local Xwiki server: --- Error number 3201 in 3: Exception while saving document Main.docg Wrapped Exception: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.xpn.xwiki.objects.LargeStringProperty# XWiki.esbachb ] com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception while saving document Main.docg Wrapped Exception: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.xpn.xwiki.objects.LargeStringProperty# XWiki.esbachb ] ...<snip> --- Often this happens with a document that's just never had any changes done to it, sometimes it doesn't happen. It has happened a few times with user accounts. Data is always saved though. Any thoughts?