Since commit bfc61051 [1] the build is failing. The error is 'mb_convert_encoding(): Illegal character encoding specified' [2] which seems to be unrelated to the commit. Any clues?

[1] https://github.com/phpmyadmin/phpmyadmin/commit/bfc61051b78f562914d12b60e0ae94dd131c2ba0

[2] https://travis-ci.org/phpmyadmin/phpmyadmin/jobs/41560886
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