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Update Wordpress to 4.9.4 which fixes an issue introduced in 4.9.3.
4.9.3 fixes 34 bugs:
https://codex.wordpress.org/Version_4.9.3
https://codex.wordpress.org/Version_4.9.4
4.9.3 fixes 34 bugs:
https://codex.wordpress.org/Version_4.9.3
https://codex.wordpress.org/Version_4.9.4