title: EXC_BREAKPOINT with very large line number value in crashlytics swift/ios
body: <p>I am getting a worrying amount of EXC_BREAKPOINT crashes in crashlytics for my iOS swift app.</p>
  
  <p>I tried fixing the bug by looking at the method 'populate(user:withLegacyUsage:)' and making sure my optional are correctly unwrapped. In this method I was also removing elements in an array while I was looping over that array. I thought that might have caused the error, but the error still happens after uploading my patched build.</p>
  
  <p>I guess I have two questions:</p>
  
  <ol>
  <li><p>Why are some of the crashing line numbers so extremely large? "+ 4304075872" is not possible to be a line in my app. I don't have that much code. Does this mean there is some kind of loop going on? Might this be the issue? Or is this normal?</p></li>
  <li><p>How to deal with EXC_BREAKPOINTS crashes in general? How - looking at the stack trace - can I have a better understanding of where the crash occurs? Is it residing at a more low-level place? Does it have to do with memory leaks? Retain cycles? I am lost.</p></li>
  </ol>
  
  <p>Thank you for any tips or help!</p>
  
  <pre><code>Crashed: com.apple.main-thread
  0  myAppName                      0x1008d3c60 closure #3 in UserManager.populate(user:withLegacyUsage:) + 4304075872 (&lt;compiler-generated&gt;:4304075872)
  1  myAppName                      0x1008d6c74 specialized UserManager.populate(user:withLegacyUsage:) + 4304088180 (&lt;compiler-generated&gt;:4304088180)
  2  myAppName                      0x1008d3664 closure #1 in UserManager.loadLegacyUsers(withCompletionHandler:) + 129 (UserManager.swift:129)
  3  myAppName                      0x1008f0f34 closure #1 in LoginViewController.viewDidLoad() + 4304195380 (&lt;compiler-generated&gt;:4304195380)
  4  myAppName                      0x1008f39cc partial apply for closure #1 in LoginViewController.playIntroAnimation(withCompletionHandler:) + 4304206284 (&lt;compiler-generated&gt;:4304206284)
  5  myAppName                      0x1008c9e90 partial apply for closure #1 in AnimationManager.playAnimation(inView:withCompletionHandler:) + 4304035472 (&lt;compiler-generated&gt;:4304035472)
  6  Lottie                         0x101315b78 $s6Lottie27AnimationCompletionDelegateC16animationDidStop_8finishedySo11CAAnimationC_SbtF + 416
  7  Lottie                         0x101315bec $s6Lottie27AnimationCompletionDelegateC16animationDidStop_8finishedySo11CAAnimationC_SbtFTo + 64
  8  QuartzCore                     0x18d6efdac CA::Layer::run_animation_callbacks(void*) + 276
  9  libdispatch.dylib              0x186927184 _dispatch_client_callout + 16
  10 libdispatch.dylib              0x1868d9190 _dispatch_main_queue_callback_4CF$VARIANT$mp + 1044
  11 CoreFoundation                 0x186bd85e4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
  12 CoreFoundation                 0x186bd35d8 __CFRunLoopRun + 2004
  13 CoreFoundation                 0x186bd2adc CFRunLoopRunSpecific + 464
  14 GraphicsServices               0x190b73328 GSEventRunModal + 104
  15 UIKitCore                      0x18ace063c UIApplicationMain + 1936
  16 myAppName                      0x100875110 main + 12 (AppDelegate.swift:12)
  17 libdyld.dylib                  0x186a5c360 start + 4
  </code></pre>