Is this with fiber data? Do you have Fiber Manager?
We have seen this error with Fiber Manager when clicking on a fiber network junction such as a Patch Location or Splitter with the Connection Manager tool. It is caused by having this network features snapped midspan on a fiber optic cable. These features should only be connected an the end of a given fiber cable. To prevent this happening the autoupdater ArcFM Fiber Optic Cable Splitter should be assigned to the On Feature Create.
If you don't use Fiber Manager then I've not seen this error outside of Fiber Manager. Is there anything in the Miner event log?