I propose the following solution for this problem.

** Patch added: "Proposed patch"

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  Negative search terms don't cope with NULL columns

Status in Zeitgeist Framework:

Bug description:
  The subject origin (and soon the event origin) columns may be NULL
  when an event/subject doesn't have a value for the field. However, the
  negation/wildcard handling code doesn't cope with this case.

  This can be reproduced with the test case
  testFindWithEventOriginNegatedWildcard from

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