Hello and thank you!
I made a fresh new WordPress install (all up to date and no other plugins etc.) and I still get erros with All-in-One WP Migration. This is my error log (from All-in-One WP Migration):
{"type":1,"message":"Uncaught Error: Cannot access property started with '\\0' in \/home\/XXXX\/public_html\/XXXX\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/vendor\/servmask\/database\/class-ai1wm-database-utility.php:79\nStack trace:\n#0 \/home\/XXXX\/public_html\/XXXX\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/vendor\/servmask\/database\/class-ai1wm-database-utility.php(79): Ai1wm_Database_Utility::replace_serialized_values(Array, Array, Object(DUP_Database), false)\n#1 \/home\/XXXX\/public_html\/XXXX\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/vendor\/servmask\/database\/class-ai1wm-database-utility.php(65): Ai1wm_Database_Utility::replace_serialized_values(Array, Array, Object(DUP_Package), true)\n#2 \/home\/XXXX\/public_html\/XXXX\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/vendor\/servmask\/database\/class-ai1wm-database.php(1508): Ai1wm_Database_Utility::replace_serialized_values(Array, Array, 'O:11:\"DUP_Packa...')\n#3 [internal function]: Ai1wm_Database->replace_table_values_callback(Array)","file":"\/home\/XXXX\/public_html\/XXXX\/wp-content\/plugins\/all-in-one-wp-migration\/lib\/vendor\/servmask\/database\/class-ai1wm-database-utility.php","line":79}
When I disabled Duplicator everything is fine.
Hope this helps?