override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
Timer.scheduledTimer(withTimeInterval: 1, repeats: false) { t in

  let u = XXXXXgetUsername()
  let p = XXXXXgetPassword()

  if (u == "" || p == "") {
    self.performSegue(withIdentifier: "gotoLogin", sender: self)
  } else {
    if (getPIN() != "" && !pinVerified) {
      self.performSegue(withIdentifier: "gotoPIN", sender: self)
    } else {
      //FAILS at this segue
      self.performSegue(withIdentifier: "gotoHome", sender: self) //LINE 37
    }
  }
}

(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x0000000103ff8f11 libobjc.A.dylib`objc_exception_throw
frame #1: 0x0000000105702079 CoreFoundation`-[NSException raise] + 9
frame #2: 0x0000000103a17a63 Foundation`-[NSObject(NSKeyValueCoding)
setValue:forKey:] + 292
frame #3: 0x0000000106745117 UIKit`-[UIViewController setValue:forKey:] + 87
frame #4: 0x0000000106f6bea3 UIKit`-[UINibKeyValuePair apply] + 63
frame #5: 0x00000001056a53cd CoreFoundation`-[NSArray
makeObjectsPerformSelector:] + 317
frame #6: 0x0000000106a355d0 UIKit`-[UINib instantiateWithOwner:options:] +
1837
frame #7: 0x0000000106ec5fc2 UIKit`-[UIStoryboard
instantiateViewControllerWithIdentifier:] + 181
frame #8: 0x0000000106ed5874 UIKit`-[UIStoryboardSegueTemplate
instantiateOrFindDestinationViewControllerWithSender:] + 90
frame #9: 0x0000000106ed5ab8 UIKit`-[UIStoryboardSegueTemplate _perform:] + 52
frame #10: 0x0000000106750324 UIKit`-[UIViewController
performSegueWithIdentifier:sender:] + 99
* frame #11: 0x0000000102356516 XXXXXIOS`closure #1 in
StartupViewController.viewDidAppear(t=0x0000608000167ec0,
self=0x00007ffd4ed061d0) at StartupViewController.swift:37
frame #12: 0x00000001023565ea XXXXXIOS`partial apply for closure #1 in
StartupViewController.viewDidAppear(_:) at StartupViewController.swift:0
frame #13: 0x000000010222fcee XXXXXIOS`thunk for @callee_owned (@owned Timer)
-> () at SensorViewController.swift:0
frame #14: 0x0000000103a60b1e Foundation`__NSFireTimer + 83
frame #15: 0x0000000105692174
CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
frame #16: 0x0000000105691e32 CoreFoundation`__CFRunLoopDoTimer + 1026
frame #17: 0x00000001056919ea CoreFoundation`__CFRunLoopDoTimers + 266
frame #18: 0x0000000105689404 CoreFoundation`__CFRunLoopRun + 2308
frame #19: 0x0000000105688889 CoreFoundation`CFRunLoopRunSpecific + 409
frame #20: 0x000000010d3929c6 GraphicsServices`GSEventRunModal + 62
frame #21: 0x00000001065a55d6 UIKit`UIApplicationMain + 159
frame #22: 0x000000010243a2a7 XXXXXIOS`main at AppDelegate.swift:13
frame #23: 0x00000001093d6d81 libdyld.dylib`start + 1