Ref T11808. This variable is wrong, and would sometimes cause events to set themsevles as their own parents. They would then fail to load, and disrupt cursor paging.

• Reproduced T11808 locally by reloading test data 2+ times, creating events with themselves as their own parents.
• Appplied fix.
• Nuked data, reloaded, no more self-parents.
• Test datafile:
  T11808.ics5 KBDownload