2017-06-14 11:41:25.360 Chromium[2811:2978518] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[1]'
*** First throw call stack:
(
	0   CoreFoundation                      0x00000001188aad4b __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x000000011cdb821e objc_exception_throw + 48
	2   CoreFoundation                      0x00000001187c115f -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 351
	3   CoreFoundation                      0x00000001187c0fcb +[NSDictionary dictionaryWithObjects:forKeys:count:] + 59
	4   Chromium                            0x000000010ca78143 -[PasswordGenerationPromptView configure] + 1059
	5   Chromium                            0x000000010ca7a770 -[PasswordGenerationPromptDialog configureGlobalViewWithPassword:] + 240
	6   Chromium                            0x000000010ca7b152 -[PasswordGenerationPromptViewController viewDidLoad] + 306
	7   UIKit                               0x000000011710fa3d -[UIViewController loadViewIfRequired] + 1258
	8   UIKit                               0x000000011710fe70 -[UIViewController view] + 27
	9   UIKit                               0x00000001170f1ac5 -[UIPresentationController presentedView] + 48
	10  Chromium                            0x000000010c2619eb __58-[MDCDialogPresentationController keyboardWatcherHandler:]_block_invoke + 139
	11  UIKit                               0x00000001170285c0 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 581
	12  UIKit                               0x0000000117028ad9 +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 105
	13  Chromium                            0x000000010c261935 -[MDCDialogPresentationController keyboardWatcherHandler:] + 245
	14  CoreFoundation                      0x00000001188485ec __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
	15  CoreFoundation                      0x00000001188484eb _CFXRegistrationPost + 427
	16  CoreFoundation                      0x0000000118848252 ___CFXNotificationPost_block_invoke + 50
	17  CoreFoundation                      0x000000011880b282 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 2018
	18  CoreFoundation                      0x000000011880a31b _CFXNotificationPost + 667
	19  Foundation                          0x00000001195c981b -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
	20  Chromium                            0x000000010c2a0325 -[MDCKeyboardWatcher updateOffsetWithUserInfo:forceHidden:notificationToPost:] + 213
	21  Chromium                            0x000000010c2a0512 -[MDCKeyboardWatcher keyboardWillChangeFrame:] + 114
	22  CoreFoundation                      0x00000001188485ec __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
	23  CoreFoundation                      0x00000001188484eb _CFXRegistrationPost + 427
	24  CoreFoundation                      0x0000000118848252 ___CFXNotificationPost_block_invoke + 50
	25  CoreFoundation                      0x000000011880b282 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 2018
	26  CoreFoundation                      0x000000011880a31b _CFXNotificationPost + 667
	27  Foundation                          0x00000001195c981b -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
	28  UIKit                               0x00000001179e3dbf -[UIInputWindowController postStartNotifications:withInfo:] + 227
	29  UIKit                               0x00000001179e60f7 __77-[UIInputWindowController moveFromPlacement:toPlacement:starting:completion:]_block_invoke.871 + 382
	30  UIKit                               0x00000001170285c0 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 581
	31  UIKit                               0x0000000117028a4d +[UIView(UIViewAnimationWithBlocks) _animateWithDuration:delay:options:animations:start:completion:] + 119
	32  UIKit                               0x00000001179e5b24 -[UIInputWindowController moveFromPlacement:toPlacement:starting:completion:] + 1627
	33  UIKit                               0x00000001179edb0b -[UIInputWindowController setInputViewSet:] + 1700
	34  UIKit                               0x00000001179e5138 -[UIInputWindowController performOperations:withAnimationStyle:] + 50
	35  UIKit                               0x000000011765833d -[UIPeripheralHost(UIKitInternal) setInputViews:animationStyle:] + 1432
	36  UIKit                               0x00000001176595f8 -[UIPeripheralHost(UIKitInternal) _preserveInputViewsWithId:animated:reset:] + 498
	37  UIKit                               0x0000000117121543 -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1178
	38  UIKit                               0x000000011712328e -[UIViewController _presentViewController:withAnimationController:completion:] + 4971
	39  UIKit                               0x000000011712626b -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 530
	40  UIKit                               0x0000000117125d51 -[UIViewController presentViewController:animated:completion:] + 179
	41  Chromium                            0x000000010c869e0a -[BrowserViewController presentViewController:animated:completion:] + 2426
	42  Chromium                            0x000000010ca30fc5 -[MainViewController presentViewController:animated:completion:] + 85
	43  Chromium                            0x000000010ca7bc60 -[PasswordsUiDelegateImpl showGenerationAlertWithPassword:andPromptDelegate:] + 960
	44  Chromium                            0x000000010c2091a5 -[PasswordGenerationAgent generatePassword] + 229
	45  UIKit                               0x0000000116f6f8bc -[UIApplication sendAction:to:from:forEvent:] + 83
	46  UIKit                               0x00000001170f5c38 -[UIControl sendAction:to:forEvent:] + 67
	47  UIKit                               0x00000001170f5f51 -[UIControl _sendActionsForEvents:withEvent:] + 444
	48  UIKit                               0x00000001170f4e4d -[UIControl touchesEnded:withEvent:] + 668
	49  UIKit                               0x0000000116fdd545 -[UIWindow _sendTouchesForEvent:] + 2747
	50  UIKit                               0x0000000116fdec33 -[UIWindow sendEvent:] + 4011
	51  UIKit                               0x0000000116f8b9ab -[UIApplication sendEvent:] + 371
	52  UIKit                               0x000000011777872d __dispatchPreprocessedEventFromEventQueue + 3248
	53  UIKit                               0x0000000117771463 __handleEventQueue + 4879
	54  CoreFoundation                      0x000000011884f761 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	55  CoreFoundation                      0x000000011883498c __CFRunLoopDoSources0 + 556
	56  CoreFoundation                      0x0000000118833e76 __CFRunLoopRun + 918
	57  CoreFoundation                      0x0000000118833884 CFRunLoopRunSpecific + 420
	58  GraphicsServices                    0x000000011dfc7a6f GSEventRunModal + 161
	59  UIKit                               0x0000000116f6dc68 UIApplicationMain + 159
	60  Chromium                            0x000000010bbe4e9b main + 1051
	61  libdyld.dylib                       0x00000001204ca68d start + 1
	62  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Thanks for the report. Password generation should be behind a flag and is definitely not ready on iOS yet. Therefore fixing this crash is not a priority now. I will leave this as Available, so that we don't forget to check it before launching on iOS.

Also, I think this might have been caused by the bug fixed in https://codereview.chromium.org/2942003002/.

FWIW, this was a pretty fresh simulator instance with no non-default flags or settings specified. From c4, I would then have expected not to even see the password generator prompt.

I checked the repro steps with Chrome 61.0.3134.0 on iOS and the crash is no more (see #5 for why). Therefore closing the bug.

Thanks for pointing out that we are actually shipping this to some groups of users, rogerm@! I will follow-up with dvadym@, who leads this project, to fix that.