Do not attempt to show the paste popup if the view is detached.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 4c199e0970ca7606cf224abdff13e083663f5c2c..bca04351c93fd6d8d83601315014d08d85a7722b 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -2539,6 +2539,10 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     }
 
     private boolean showPastePopup(int x, int y) {
+        if (mContainerView.getParent() == null || mContainerView.getVisibility() != View.VISIBLE) {
+            return false;
+        }
+
         if (!mHasInsertion || !canPaste()) return false;
         final float contentOffsetYPix = mRenderCoordinates.getContentOffsetYPix();
         getPastePopup().show(x, (int) (y + contentOffsetYPix));