From https://crbug.com/775890:

Chrome crashes after tapping on OK button from promo dialog box

Application Version :Chrome 63.0.3239.10
Android Build Number : 7.1.2/N2G47E
Device: Google Pixel

Precondition:
“Chrome Home Promo”  enabled under chrome:// flags

Steps to reproduce:.
1.Launch chrome
2.Search anything in two tabs> Force stop chrome > Relaunch chrome
3.Put it in multi-window docked to the top of screen > Move one tab to other window > Open new tab in second window >  Tap on the clickable section that trigger promo > Tap on 'OK' from dialog box > Observe


Observed Result:
Chrome Crashes

Expected Result:
Chrome should never crash

 java.lang.AssertionError
 	at org.chromium.chrome.browser.ChromeActivity.markSessionEnd(ChromeActivity.java:2081)
 	at org.chromium.chrome.browser.ChromeActivity.onMultiWindowModeChanged(ChromeActivity.java:1777)
 	at org.chromium.chrome.browser.ChromeTabbedActivity.onMultiWindowModeChanged(ChromeTabbedActivity.java:2218)
 	at android.app.Activity.dispatchMultiWindowModeChanged(Activity.java:6898)
 	at android.app.ActivityThread.handleMultiWindowModeChanged(ActivityThread.java:2964)
 	at android.app.ActivityThread.-wrap14(ActivityThread.java)
 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1711)
 	at android.os.Handler.dispatchMessage(Handler.java:102)
 	at android.os.Looper.loop(Looper.java:154)
 	at android.app.ActivityThread.main(ActivityThread.java:6121)
 	at java.lang.reflect.Method.invoke(Native Method)
 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)