Crashes after iOS 10.2 update

The app was the perfect PDF reader before the update; it had absolutely everything one would need when working with pdfs, ability to highlight, take notes, even call out boxes, and many more. But since yesterday that I updated my OS, it crashes unexpectedly approximately 1 minute after I open a PDF. Please please please fix it.

NoniinnN about Foxit PDF Editor, v5.2.1