See question above - taken from the Wikitude FAQ section.
about 8 years ago
Please try to restart Wikitude. If this doesn?t help, restart your phone and try Wikitude again. If this doesn?t help, contact us on firstname.lastname@example.org and let us know when and how Wikitude crashes on your phone. Please don?t forget to include your phone model and your exact location. We will get back to you as soon as possible with a solution.