https://console.firebase.google.com/project/simplye-nypl/crashlytics/app/ios:org.nypl.labs.SimplyE/issues/90275be578f50e1fc18c81154007098d?time=last-twenty-four-hours&sessionEventKey=25e5ad39c9ea4e8d86bd4b2c862b0c17_1466535534920654360
this is probably related to swift-objc interoperability.