Question about DEADLOCK

I have a question related to postgres.I have an application which is transferring data from MSSQL to Postgres at some regular interval.

I had around 20,000 data in MSSQL which should be transferred to postgres.
After transferring around 12000 data I got a error message
ERROR: deadlock detected
And after that data transfer has stopped.

How to avoid this error and what is the reason for this error.
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Best Regards
- Savita
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