I have a multi exactly below

%Ecto.Multi{
  names: #MapSet<[:record_0]>,
  operations: [
    record_0: {:changeset,
     #Ecto.Changeset<
       action: :insert,
       changes: %{
         app_version: "0.7.0",
         card_id: "37faf84a-afdd-48b5-a9bd-20b789790153",
         merchant_device_id: "71aefe98-dfa8-4ba3-97ed-20419fab44f5",
         merchant_device_transaction_number: 0,
         merchant_player_id: "8ea9abcd-0c26-450d-b1d8-ed0f364b8355",
         purchase_amount: #Decimal<88.0>,
         purchase_metric_id: "3b7f242c-8831-4066-a91c-928d77764bb9",
         transaction_id: "a49cca05-e090-42ba-bb85-bae58ea4d055"
       },
       errors: [],
       data: #Pogio.V1.TransactionPurchase<>,
       valid?: true
     >, []}
  ]
}

But when I run

Repo.transaction(multi)

Boom nothing happens, no crash, no log. and I got back nothing. infact control is not returned and 500 response is sent back to user.

Elixir version (elixir -v):
Elixir 1.10.2 (compiled with Erlang/OTP 21)
Erlang/OTP version (erl):
Erlang/OTP 21
Operating system:
Erlang/OTP 21
Is this an umbrella application?:
yes
Release type (Distillery, mix release, Mix, etc.):
iex -S mix phx.server

its working perfectly fine in some cases but not in one case. Any help or workaround or help in debugging is really appreciated