Agendamento de PM de script de automação com resultados do Data Explorer não envia PMs

Para mim, parece que não consigo acionar com sucesso este script de automação, qualquer que seja a consulta do explorador de dados. Por exemplo:

SELECT username from users
LIMIT 10

Erro 500 ao acionar manualmente da Automação:

Mensagem (3 cópias relatadas)

TypeError (Nil não é uma fonte JSON válida.)
app/controllers/application_controller.rb:418:in `block in with_resolved_locale'
app/controllers/application_controller.rb:418:in `with_resolved_locale'
lib/middleware/omniauth_bypass_middleware.rb:74:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:369:in `call'
config/initializers/100-quiet_logger.rb:20:in `call'
config/initializers/100-silence_logger.rb:29:in `call'
lib/middleware/enforce_hostname.rb:24:in `call'
lib/middleware/request_tracker.rb:228:in `call'

Backtrace

plugins/discourse-data-explorer/lib/report_generator.rb:42:in `parse'
plugins/discourse-data-explorer/lib/report_generator.rb:42:in `params_to_hash'
plugins/discourse-data-explorer/lib/report_generator.rb:15:in `generate'
plugins/discourse-data-explorer/plugin.rb:117:in `block (4 levels) in activate!'
plugins/discourse-automation/app/models/discourse_automation/automation.rb:83:in `trigger!'
plugins/discourse-automation/app/controllers/discourse_automation/automations_controller.rb:10:in `trigger'
actionpack (7.0.4.3) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (7.0.4.3) lib/abstract_controller/base.rb:215:in `process_action'
actionpack (7.0.4.3) lib/action_controller/metal/rendering.rb:53:in `process_action'
actionpack (7.0.4.3) lib/abstract_controller/callbacks.rb:234:in `block in process_action'

Env

HTTP HOSTS: discourse.canapin.dev