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For some reason i can't save any of translations, after i click "save" nothing happens and there's error in console coming up:

translations.bundle.js?1.7.5.2:185 POST http://mypage.com/303/index.php/api/translations/edit?_token=FQa1uoepDz15AAgVwxLOJmgikQPYKU2ZeA9lVczw-e0 500 (Internal Server Error)

translations.bundle.js?1.7.5.2:121 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0
    at JSON.parse (<anonymous>)
    at translations.bundle.js?1.7.5.2:121

it comes from "new-theme" in admin themes folder.

PS 1.7.5.2

PHP 7.1

Debug info in attachment.

- Two active languages(polish and english)

It's brand new installation from 1.7.5.2(it hasn't been updated via 1-clik upgrade or anything).

Any idea how to fix it?

For some reason i can't save any of translations, after i click "save" nothing happens and there's error in console coming up:

translations.bundle.js?1.7.5.2:185 POST http://mypage.com/admin/index.php/api/translations/edit?_token=FQa1uoepDz15AAgVwxLOJmgikQPYKU2ZeA9lVczw-e0 500 (Internal Server Error)

translations.bundle.js?1.7.5.2:121 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0
    at JSON.parse (<anonymous>)
    at translations.bundle.js?1.7.5.2:121

it comes from "new-theme" in admin themes folder.

PS 1.7.5.2

PHP 7.1

Debug info in attachment.

- Two active languages(polish and english)

It's brand new installation from 1.7.5.2(it hasn't been updated via 1-clik upgrade or anything).

Any idea how to fix it?