"CGAffineTransformInvert: singular matrix Error" in iad

* thread #1: tid = 0xa095a, 0x000000018353d64c CoreGraphics`CGPostError, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
  * frame #0: 0x000000018353d64c CoreGraphics`CGPostError
    frame #1: 0x00000001834f5500 CoreGraphics`CGAffineTransformInvert + 84
    frame #2: 0x00000001880ac598 UIKit`-[_UIRemoteView applyTransformUndoingRemoteRootLayerTransform:frame:] + 148
    frame #3: 0x00000001880ac4f0 UIKit`-[_UIRemoteView setHostedWindowHostingHandle:] + 220
    frame #4: 0x000000018867f2cc iAd`-[ADAdSpace setServiceAdSpace:] + 308
    frame #5: 0x000000018325c434 CoreFoundation`__CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20
    frame #6: 0x000000018319b7e0 CoreFoundation`_CFXNotificationPost + 2060
    frame #7: 0x00000001840936c0 Foundation`-[NSNotificationCenter postNotificationName:object:userInfo:] + 72
    frame #8: 0x00000001000f4f20 libdispatch.dylib`_dispatch_call_block_and_release + 24
    frame #9: 0x00000001000f4ee0 libdispatch.dylib`_dispatch_client_callout + 16
    frame #10: 0x00000001000f984c libdispatch.dylib`_dispatch_main_queue_callback_4CF + 1056
    frame #11: 0x000000018326d8dc CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
    frame #12: 0x000000018326b984 CoreFoundation`__CFRunLoopRun + 1492
    frame #13: 0x0000000183199664 CoreFoundation`CFRunLoopRunSpecific + 396
    frame #14: 0x000000018c2db5a4 GraphicsServices`GSEventRunModal + 168
    frame #15: 0x0000000187a9e984 UIKit`UIApplicationMain + 1488