Error message
Warning: Trying to access array offset on null in eurydice_preprocess_book_navigation() (line 1266 of themes/custom/eurydice/eurydice.theme).Warning: Trying to access array offset on null in eurydice_preprocess_book_navigation() (line 1266 of themes/custom/eurydice/eurydice.theme).Warning: Trying to access array offset on null in eurydice_preprocess_book_navigation() (line 1266 of themes/custom/eurydice/eurydice.theme).