SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'project' cannot be null

In ExceptionHandler.php line 45:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'project' cann
ot be null: INSERT INTO "locale_file" ("project", "langcode", "version", "t
imestamp", "last_checked") VALUES (:db_insert_placeholder_0, :db_insert_pla
ceholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_
placeholder_4); Array
(
[:db_insert_placeholder_0] =>
[:db_insert_placeholder_1] => en
[:db_insert_placeholder_2] =>
[:db_insert_placeholder_3] => 0
[:db_insert_placeholder_4] => 0
)

In StatementWrapperIterator.php line 111:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'project' cann
ot be null