Problem with translation

[maxikuku]

Hello!

When I try to translate some fields in backoffice translation I get an error in the log

An exception occurred while executing \'INSERT INTO ps_translation 
`key`, translation, domain, theme, id_lang) VALUES (?, ?, ?, ?, ?)\' 
with params [\"Guest Order Tracking\", \"\\u041e\\u0442\\u0441\\u043b\\u0435\
\u0436\\u0438\\u0432\\u0430\\u043d\\u0438\\u0435 \\u0437\\u0430\\u043a\\u0430\
\u0437\\u0430\", \"ShopThemeCustomerAccount\", \"wt_newdeal\", 1]:\n\nSQLSTATE[23000]: 
Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key 
constraint fails (`myshkin`.`ps_translation`, CONSTRAINT `FK_ADEBEB36BA299860` 
FOREIGN KEY (`id_lang`) REFERENCES `ps_lang` (`id_lang`))

The problem occurs only when the theme is translated. Everything was fine about a week ago.

Help me please.