Seems like this might be a bug in a plug-in or theme. From the Codex:
The form will not create a new user if any errors are returned. Notice: The function must return the variable $errors in any case (even when there is no error in your logic), otherwise the function may cause this problem: Fatal error: Call to a member function
get_error_code()
on a non-object.
Deactivate all other plug-ins to find which is causing it. If it’s still persisting, switch the theme to TwentyEeven. Once you’ve identified the culprit, you’ll need to search the code for the error – somewhere they’ll be doing something similar to you, but not returning $errors
.
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