java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Samebug tips

,
Expert tip

Check if you imported android.support.v4.app.FragmentManager and not android.app.FragmentManager. Check for naming problems in your xml files as well, might have inconsistencies!

,
Expert tip

Also, check if you're not using android.support.v4.app.FragmentTransaction with android.app.Fragment, as they're not totally compatible.

Solutions on the web

via Stack Overflow by Ayush
, 1 year ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
via Stack Overflow by sanjay
, 1 month ago
Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
via commonsware.com by Unknown author, 1 year ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
via commonsware.com by Unknown author, 1 year ago
Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
via GitHub by dobeeisfree
, 1 year ago
Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
via Stack Overflow by Ayush Khare
, 4 months ago
Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:418)
at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:408)
at com.psycho.ayush.sahanubhooti_20.MainActivity$1.onClick(MainActivity.java:30)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19761)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5253)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)

Users with the same issue

6 times, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
11 more bugmates

Know the solutions? Share your knowledge to help other developers to debug faster.