com.arcadedb.index.IndexException: Index 'stats_user_0_1987898305036' is not valid. Probably has been drop or rebuilt
	at com.arcadedb.index.lsm.LSMTreeIndex.checkIsValid(LSMTreeIndex.java:568)
	at com.arcadedb.index.lsm.LSMTreeIndex.iterator(LSMTreeIndex.java:270)
	at com.arcadedb.index.MultiIndexCursor.<init>(MultiIndexCursor.java:55)
	at com.arcadedb.index.TypeIndex.iterator(TypeIndex.java:67)
	at com.arcadedb.query.sql.executor.FetchFromIndexStep.processFlatIteration(FetchFromIndexStep.java:289)
	at com.arcadedb.query.sql.executor.FetchFromIndexStep.init(FetchFromIndexStep.java:201)
	at com.arcadedb.query.sql.executor.FetchFromIndexStep.init(FetchFromIndexStep.java:191)
	at com.arcadedb.query.sql.executor.FetchFromIndexStep.syncPull(FetchFromIndexStep.java:73)
	at com.arcadedb.query.sql.executor.GetValueFromIndexEntryStep$1.fetchNextItem(GetValueFromIndexEntryStep.java:109)
	at com.arcadedb.query.sql.executor.GetValueFromIndexEntryStep$1.hasNext(GetValueFromIndexEntryStep.java:79)
	at com.arcadedb.query.sql.executor.FilterByClassStep$1.fetchNextItem(FilterByClassStep.java:66)
	at com.arcadedb.query.sql.executor.FilterByClassStep$1.hasNext(FilterByClassStep.java:104)
	at com.arcadedb.query.sql.executor.FilterStep$1.fetchNextItem(FilterStep.java:63)
	at com.arcadedb.query.sql.executor.FilterStep$1.hasNext(FilterStep.java:99)
	at com.arcadedb.query.sql.executor.ProjectionCalculationStep$1.hasNext(ProjectionCalculationStep.java:50)
	at com.arcadedb.query.sql.parser.LocalResultSet.fetchNext(LocalResultSet.java:49)
	at com.arcadedb.query.sql.parser.LocalResultSet.<init>(LocalResultSet.java:42)
	at com.arcadedb.query.sql.parser.SelectStatement.execute(SelectStatement.java:206)
	at com.arcadedb.query.sql.parser.Statement.execute(Statement.java:86)
	at com.arcadedb.query.sql.parser.Statement.execute(Statement.java:70)
	at com.arcadedb.query.sql.SQLQueryEngine.query(SQLQueryEngine.java:59)
	at com.arcadedb.database.EmbeddedDatabase.query(EmbeddedDatabase.java:1308)