[SQLSTATE 2300] Integrite Constraint Violation When Migration from M1 to M2

You keep getting the error below, even when you revert back to the initial state of the DB in Magento 2.

Solution:

Go to /vendor/magento/data-migration-tool/etc/opensource-to-opensource/magento1_version/config.xml

change:

 <bulk_size>0</bulk_size> 

to

 <bulk_size>100</bulk_size>