I am working with sqlite db and use some code of Alex LockWood Correctly Managing Your SQLite Database

It works very well but sometimes I got the error "java.lang.IllegalStateException: Cannot perform this operation because the connection pool has been closed." Here is the full Error:

02-20 16:37:21.385: W/dalvikvm(25730): threadid=13: thread exiting with uncaught exception (group=0x41c122a0)
02-20 16:37:21.390: E/AndroidRuntime(25730): FATAL EXCEPTION: Timer-0
02-20 16:37:21.390: E/AndroidRuntime(25730): java.lang.IllegalStateException: Cannot perform this operation because the connection pool has been closed.
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteConnectionPool.throwIfClosedLocked(SQLiteConnectionPool.java:963)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteConnectionPool.waitForConnection(SQLiteConnectionPool.java:678)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteConnectionPool.acquireConnection(SQLiteConnectionPool.java:349)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteSession.acquireConnection(SQLiteSession.java:894)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteSession.executeForCursorWindow(SQLiteSession.java:834)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:62)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:143)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:133)
02-20 16:37:21.390: E/AndroidRuntime(25730):    at com.uit.pokemon.DatabaseHandler.getStadiumStatusById(DatabaseHandler.java:533)
02-20 16:37:21.390: E/And
android sqlite
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