| Index: chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeManager.java
 | 
| diff --git a/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeManager.java b/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeManager.java
 | 
| index 4c03b7ed7465237fb56ca768b72ec10ed0e437b6..141a6837ebf1b95787131aa8bc9debf7e4d6be8c 100644
 | 
| --- a/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeManager.java
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| +++ b/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeManager.java
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| @@ -156,6 +156,8 @@ public class ReaderModeManager extends TabModelSelectorTabObserver
 | 
|  
 | 
|      @Override
 | 
|      public void onShown(Tab shownTab) {
 | 
| +        if (mTabModelSelector == null) return;
 | 
| +
 | 
|          int shownTabId = shownTab.getId();
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|          Tab previousTab = mTabModelSelector.getTabById(mTabId);
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|          mTabId = shownTabId;
 | 
| 
 |