Merge users not possible from UI or CLI

Hello community,

Discourse version : 2.9.0.beta9( 42c64abe15 )

After a merger of two successful Discourse communities, there are some duplicate users (especially those who did not put the same addresses)

But unfortunately, the user merge tool integrated in the UI does not work, it runs in a loop without stopping.
So I tried it in CLI, but it also failed.

cd /var/discourse
./launcher enter app

from user root discourse

rake users:merge['olduser','keepuser']

Do you manage to merge users in your instances via the UI? (I point out that they are not moderators or admins)

do you have an idea ?

Thanks for advance

Here are the traces.

root@discoursetest-app:~# rake users:merge['olduser','keepuser'] --trace
** Invoke users:merge (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute users:merge
rake aborted!
ArgumentError: topic
/var/www/discourse/app/services/post_owner_changer.rb:13:in `block in initialize'
/var/www/discourse/app/services/post_owner_changer.rb:12:in `each'
/var/www/discourse/app/services/post_owner_changer.rb:12:in `initialize'
/var/www/discourse/app/services/user_merger.rb:71:in `new'
/var/www/discourse/app/services/user_merger.rb:71:in `change_post_owner'
/var/www/discourse/app/services/user_merger.rb:59:in `block in move_posts'
/var/www/discourse/app/services/user_merger.rb:57:in `each'
/var/www/discourse/app/services/user_merger.rb:57:in `move_posts'
/var/www/discourse/app/services/user_merger.rb:14:in `merge!'
/var/www/discourse/lib/tasks/users.rake:50:in `block in <main>'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `block in execute'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `each'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:279:in `execute'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:219:in `block in invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:199:in `synchronize'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:199:in `invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/task.rb:188:in `invoke'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:160:in `invoke_task'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `each'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:116:in `block in top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:125:in `run_with_threads'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:110:in `top_level'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:83:in `block in run'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:186:in `standard_exception_handling'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rake-13.0.6/lib/rake/application.rb:80:in `run'
bin/rake:13:in `<top (required)>'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli/exec.rb:58:in `load'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli/exec.rb:58:in `kernel_load'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli/exec.rb:23:in `run'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli.rb:483:in `exec'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli.rb:31:in `dispatch'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/cli.rb:25:in `start'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/exe/bundle:48:in `block in <top (required)>'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/lib/bundler/friendly_errors.rb:120:in `with_friendly_errors'
/usr/local/lib/ruby/gems/2.7.0/gems/bundler-2.3.18/exe/bundle:36:in `<top (required)>'
/usr/local/bin/bundle:25:in `load'
/usr/local/bin/bundle:25:in `<main>'
Tasks: TOP => users:merge

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