Add a null check to ChromeActivity#onStartWithNative()

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
index 95a674dcc2384c7a294d5a09495ec958e3cdc62f..d3d7d3b4e862583e18f1249f0100772fcaa2006c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
@@ -578,7 +578,7 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
         // #onPageLoadFinished() and #onCrash(). If we are not actively loading a tab (e.g.
         // in Android N multi-instance, which is created by re-parenting an existing tab),
         // ensure onDeferredStartup() gets called by calling postDeferredStartupIfNeeded() here.
-        if (!getActivityTab().isLoading()) {
+        if (getActivityTab() == null || !getActivityTab().isLoading()) {
             postDeferredStartupIfNeeded();
         }
     }