realm-java: equalTo(String, boolean) -> Illegal Argument: ColumnType invalid

Goal

We’re using Realm in a library project. For synchronization, we’re using a SyncAdapter. In the synchronization process, we got a simple query with a equalTo(String, boolean) selection to get all Persons whose flag modified_offline is true.

Expected Results

Getting every person which is marked as modified offline.

Actual Results

In some rare cases, it crashes and throws an IllegalArgumentException: Illegal Argument: ColumnType invalid. We got 4 crashes in the last week with a few hundred synchronizations a day. The code is executed in every synchronization.

Stack Trace:

#0. Crashed: SyncAdapterThread-34: 0 0 0x0000000000000000
       at io.realm.internal.TableQuery.nativeEqual(TableQuery.java)
       at io.realm.internal.TableQuery.equalTo(TableQuery.java:265)
       at io.realm.RealmQuery.equalTo(RealmQuery.java:407)
       at com.example.app.sync.SyncAdapter.syncPersons(PkSyncAdapter.java:164)
       at com.example.app.sync.SyncAdapter.syncComplete(PkSyncAdapter.java:147)
       at com.example.app.sync.SyncAdapter.onPerformSync(PkSyncAdapter.java:103)
       at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:272)

--

Fatal Exception: java.lang.IllegalArgumentException: Illegal Argument: ColumnType invalid.
       at io.realm.internal.TableQuery.nativeEqual(TableQuery.java)
       at io.realm.internal.TableQuery.equalTo(TableQuery.java:265)
       at io.realm.RealmQuery.equalTo(RealmQuery.java:407)
       at com.example.app.sync.SyncAdapter.syncDongles(PkSyncAdapter.java:164)
       at com.example.app.sync.SyncAdapter.syncComplete(PkSyncAdapter.java:147)
       at com.example.app.sync.SyncAdapter.onPerformSync(PkSyncAdapter.java:103)
       at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:272)

Steps & Code to Reproduce

Cannot reproduce it… Seems to be a fairly simple operation.

Code Sample

SyncAdapter:

@Override
public void onPerformSync(Account account, Bundle extras, String authority,
                              ContentProviderClient provider, SyncResult syncResult) {
    Realm.init(getContext());
    Realm realm = Realm.getInstance(MyApp.getRealmConfig(getContext()));

    // Here's the crash:
    RealmResults<Person> persons = realm.where(Person.class)
             .equalTo(Person.MODIFIED_OFFLINE, true)
             .findAll();

MyApp:

public static RealmConfiguration getRealmConfig(Context context) {
    return new RealmConfiguration.Builder()
             .name(REALM_NAME)
             .modules(new MyModule())
             .encryptionKey(getRealmEncryptionKey(context))
             .schemaVersion(REALM_SCHEMA_VERSION)
             .deleteRealmIfMigrationNeeded()
             .build();
}

MyModule:

@RealmModule(library = true, allClasses = true)
public class MyModule { }

Person:

public class Person extends RealmObject {
   static final String MODIFIED_OFFLINE = "modified_offline";

    @PrimaryKey
    private String id;
    private boolean modified_offline;
    ...

Version of Realm and tooling

Realm version: 2.0.2

Android Studio version: 2.2.2

Which Android version and device: 6.0.1 (Samsung, Sony)