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After updating from 7.x-2.3 to 7.x-2.5 via drush Chrome give me the following error when I try to edit a rule.
No data received. Error code: ERR_EMPTY_RESPONSE
I reverted back to 7.x-2.3 and it resolved it for me (by reverting I mean uninstalling 2.5 and reinstalling 2.3 and recreating rules).