Code (Lines 54, 55, 56):

Log.v("", "mSearchTask is ? " + mSearchTask == null ? "NULL" : "NOT NULL");
Log.v("", "listener is ? " + listener == null ? "NULL" : "NOT NULL");
mSearchTask.attachListener(listener);

Logs:

12-07 11:18:26.757: V/(2986): NOT NULL
12-07 11:18:26.757: V/(2986): NOT NULL
...
12-07 11:18:26.761: E/AndroidRuntime(2986): Caused by: java.lang.NullPointerException
12-07 11:18:26.761: E/AndroidRuntime(2986): at SearchResultsFragment.onCreate(SearchResultsFragment.java:56)