有人知道这是什么意思吗？
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): Caused by: java.lang.IllegalArgumentException: the bind value at index 1 is null
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.database.sqlite.SQLiteProgram.bindString(SQLiteProgram.java:234)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.database.sqlite.SQLiteQuery.bindString(SQLiteQuery.java:182)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:48)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1345)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:330)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:280)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.providers.ProductContentProvider.query(ProductContentProvider.java:350)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.content.ContentProvider$Transport.query(ContentProvider.java:163)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.content.ContentResolver.query(ContentResolver.java:245)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.providers.FacadeContentProvider.query(FacadeContentProvider.java:563)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.content.ContentProvider$Transport.query(ContentProvider.java:163)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.content.ContentResolver.query(ContentResolver.java:245)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.util.ScanAddTask.existsProduct(ScanAddTask.java:164)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.util.ScanAddTask.<init>(ScanAddTask.java:71)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.util.ItemScanAddTask.<init>(ItemScanAddTask.java:34)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.ui.activities.collections.cd.CDCollectionViewWindow$MusicCDItemScanAddTask.<init>(CDCollectionViewWindow.java:147)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.ui.activities.collections.cd.CDCollectionViewWindow.restoreLocalState(CDCollectionViewWindow.java:1044)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at net.lp.collectionista.ui.activities.collections.cd.CDCollectionViewWindow.onRestoreInstanceState(CDCollectionViewWindow.java:966)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.app.Activity.performRestoreInstanceState(Activity.java:815)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1096)
12-31 20:55:45.861: ERROR/AndroidRuntime(12478): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2641)