clicking through to WP leads to "Bad Title" error page

When I tried to follow the link to en WP in the gender game, I got an error page on WP saying "Bad title / The requested page title is invalid. It may be empty, contain unsupported characters, or include a non-local or incorrectly linked interwiki prefix. ..." The item was Q16078932, the URL in my browser was https://en.wikipedia.org/wiki/Ern%20O&39;Regan, and the intended URL was https://en.wikipedia.org/wiki/Ern_O%27Regan. This type of error has happened a handful of times before.

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