diff --git a/core/java/android/app/BackStackRecord.java b/core/java/android/app/BackStackRecord.java
index e9e8e1626a2ac..96814b725463f 100644
--- a/core/java/android/app/BackStackRecord.java
+++ b/core/java/android/app/BackStackRecord.java
@@ -53,7 +53,7 @@ final class BackStackState implements Parcelable {
         int pos = 0;
         while (op != null) {
             mOps[pos++] = op.cmd;
-            mOps[pos++] = op.fragment.mIndex;
+            mOps[pos++] = op.fragment != null ? op.fragment.mIndex : -1;
             mOps[pos++] = op.enterAnim;
             mOps[pos++] = op.exitAnim;
             mOps[pos++] = op.popEnterAnim;
@@ -99,8 +99,13 @@ final class BackStackState implements Parcelable {
             op.cmd = mOps[pos++];
             if (FragmentManagerImpl.DEBUG) Log.v(FragmentManagerImpl.TAG,
                     "BSE " + bse + " set base fragment #" + mOps[pos]);
-            Fragment f = fm.mActive.get(mOps[pos++]);
-            op.fragment = f;
+            int findex = mOps[pos++];
+            if (findex >= 0) {
+                Fragment f = fm.mActive.get(findex);
+                op.fragment = f;
+            } else {
+                op.fragment = null;
+            }
             op.enterAnim = mOps[pos++];
             op.exitAnim = mOps[pos++];
             op.popEnterAnim = mOps[pos++];
@@ -506,9 +511,11 @@ final class BackStackRecord extends FragmentTransaction implements
                 + " by " + amt);
         Op op = mHead;
         while (op != null) {
-            op.fragment.mBackStackNesting += amt;
-            if (FragmentManagerImpl.DEBUG) Log.v(TAG, "Bump nesting of "
-                    + op.fragment + " to " + op.fragment.mBackStackNesting);
+            if (op.fragment != null) {
+                op.fragment.mBackStackNesting += amt;
+                if (FragmentManagerImpl.DEBUG) Log.v(TAG, "Bump nesting of "
+                        + op.fragment + " to " + op.fragment.mBackStackNesting);
+            }
             if (op.removed != null) {
                 for (int i=op.removed.size()-1; i>=0; i--) {
                     Fragment r = op.removed.get(i);
@@ -568,23 +575,29 @@ final class BackStackRecord extends FragmentTransaction implements
                             Fragment old = mManager.mAdded.get(i);
                             if (FragmentManagerImpl.DEBUG) Log.v(TAG,
                                     "OP_REPLACE: adding=" + f + " old=" + old);
-                            if (old.mContainerId == f.mContainerId) {
-                                if (op.removed == null) {
-                                    op.removed = new ArrayList<Fragment>();
+                            if (f == null || old.mContainerId == f.mContainerId) {
+                                if (old == f) {
+                                    op.fragment = f = null;
+                                } else {
+                                    if (op.removed == null) {
+                                        op.removed = new ArrayList<Fragment>();
+                                    }
+                                    op.removed.add(old);
+                                    old.mNextAnim = op.exitAnim;
+                                    if (mAddToBackStack) {
+                                        old.mBackStackNesting += 1;
+                                        if (FragmentManagerImpl.DEBUG) Log.v(TAG, "Bump nesting of "
+                                                + old + " to " + old.mBackStackNesting);
+                                    }
+                                    mManager.removeFragment(old, mTransition, mTransitionStyle);
                                 }
-                                op.removed.add(old);
-                                old.mNextAnim = op.exitAnim;
-                                if (mAddToBackStack) {
-                                    old.mBackStackNesting += 1;
-                                    if (FragmentManagerImpl.DEBUG) Log.v(TAG, "Bump nesting of "
-                                            + old + " to " + old.mBackStackNesting);
-                                }
-                                mManager.removeFragment(old, mTransition, mTransitionStyle);
                             }
                         }
                     }
-                    f.mNextAnim = op.enterAnim;
-                    mManager.addFragment(f, false);
+                    if (f != null) {
+                        f.mNextAnim = op.enterAnim;
+                        mManager.addFragment(f, false);
+                    }
                 } break;
                 case OP_REMOVE: {
                     Fragment f = op.fragment;
@@ -644,10 +657,12 @@ final class BackStackRecord extends FragmentTransaction implements
                 } break;
                 case OP_REPLACE: {
                     Fragment f = op.fragment;
-                    f.mNextAnim = op.popExitAnim;
-                    mManager.removeFragment(f,
-                            FragmentManagerImpl.reverseTransit(mTransition),
-                            mTransitionStyle);
+                    if (f != null) {
+                        f.mNextAnim = op.popExitAnim;
+                        mManager.removeFragment(f,
+                                FragmentManagerImpl.reverseTransit(mTransition),
+                                mTransitionStyle);
+                    }
                     if (op.removed != null) {
                         for (int i=0; i<op.removed.size(); i++) {
                             Fragment old = op.removed.get(i);
diff --git a/core/java/android/app/Fragment.java b/core/java/android/app/Fragment.java
index 5e6b090605a4a..28876d3286d9a 100644
--- a/core/java/android/app/Fragment.java
+++ b/core/java/android/app/Fragment.java
@@ -1503,7 +1503,7 @@ public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListene
     public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
         writer.print(prefix); writer.print("mFragmentId=#");
                 writer.print(Integer.toHexString(mFragmentId));
-                writer.print(" mContainerId#=");
+                writer.print(" mContainerId=#");
                 writer.print(Integer.toHexString(mContainerId));
                 writer.print(" mTag="); writer.println(mTag);
         writer.print(prefix); writer.print("mState="); writer.print(mState);
diff --git a/core/java/android/app/FragmentManager.java b/core/java/android/app/FragmentManager.java
index 03ee41996a4ac..9ba53059d537a 100644
--- a/core/java/android/app/FragmentManager.java
+++ b/core/java/android/app/FragmentManager.java
@@ -726,11 +726,12 @@ final class FragmentManagerImpl extends FragmentManager {
                 return;
             }
             f.mDeferStart = false;
-            moveToState(f, mCurState, 0, 0);
+            moveToState(f, mCurState, 0, 0, false);
         }
     }
 
-    void moveToState(Fragment f, int newState, int transit, int transitionStyle) {
+    void moveToState(Fragment f, int newState, int transit, int transitionStyle,
+            boolean keepActive) {
         // Fragments that are not currently added will sit in the onCreate() state.
         if (!f.mAdded && newState > Fragment.CREATED) {
             newState = Fragment.CREATED;
@@ -757,7 +758,7 @@ final class FragmentManagerImpl extends FragmentManager {
                 // animation, move to whatever the final state should be once
                 // the animation is done, and then we can proceed from there.
                 f.mAnimatingAway = null;
-                moveToState(f, f.mStateAfterAnimating, 0, 0);
+                moveToState(f, f.mStateAfterAnimating, 0, 0, true);
             }
             switch (f.mState) {
                 case Fragment.INITIALIZING:
@@ -940,7 +941,7 @@ final class FragmentManagerImpl extends FragmentManager {
                                         if (fragment.mAnimatingAway != null) {
                                             fragment.mAnimatingAway = null;
                                             moveToState(fragment, fragment.mStateAfterAnimating,
-                                                    0, 0);
+                                                    0, 0, false);
                                         }
                                     }
                                 });
@@ -992,11 +993,13 @@ final class FragmentManagerImpl extends FragmentManager {
                                 throw new SuperNotCalledException("Fragment " + f
                                         + " did not call through to super.onDetach()");
                             }
-                            if (!f.mRetaining) {
-                                makeInactive(f);
-                            } else {
-                                f.mActivity = null;
-                                f.mFragmentManager = null;
+                            if (!keepActive) {
+                                if (!f.mRetaining) {
+                                    makeInactive(f);
+                                } else {
+                                    f.mActivity = null;
+                                    f.mFragmentManager = null;
+                                }
                             }
                         }
                     }
@@ -1007,7 +1010,7 @@ final class FragmentManagerImpl extends FragmentManager {
     }
     
     void moveToState(Fragment f) {
-        moveToState(f, mCurState, 0, 0);
+        moveToState(f, mCurState, 0, 0, false);
     }
 
     void moveToState(int newState, boolean always) {
@@ -1029,7 +1032,7 @@ final class FragmentManagerImpl extends FragmentManager {
             for (int i=0; i<mActive.size(); i++) {
                 Fragment f = mActive.get(i);
                 if (f != null) {
-                    moveToState(f, newState, transit, transitStyle);
+                    moveToState(f, newState, transit, transitStyle, false);
                     if (f.mLoaderManager != null) {
                         loadersRunning |= f.mLoaderManager.hasRunningLoaders();
                     }
@@ -1122,7 +1125,7 @@ final class FragmentManagerImpl extends FragmentManager {
             fragment.mAdded = false;
             fragment.mRemoving = true;
             moveToState(fragment, inactive ? Fragment.INITIALIZING : Fragment.CREATED,
-                    transition, transitionStyle);
+                    transition, transitionStyle, false);
         }
     }
     
@@ -1189,7 +1192,7 @@ final class FragmentManagerImpl extends FragmentManager {
                     mNeedMenuInvalidate = true;
                 }
                 fragment.mAdded = false;
-                moveToState(fragment, Fragment.CREATED, transition, transitionStyle);
+                moveToState(fragment, Fragment.CREATED, transition, transitionStyle, false);
             }
         }
     }
@@ -1204,7 +1207,7 @@ final class FragmentManagerImpl extends FragmentManager {
                 if (fragment.mHasMenu && fragment.mMenuVisible) {
                     mNeedMenuInvalidate = true;
                 }
-                moveToState(fragment, mCurState, transition, transitionStyle);
+                moveToState(fragment, mCurState, transition, transitionStyle, false);
             }
         }
     }