Querying OQGraph table fails with error 1017

MariaDB [MidSchipDB_unstable]> SELECT * FROM version_history;

ERROR 1017 (HY000): Can't find file: './MidSchipDB_unstable/db_history@=Cܹ' (errno: 2 "No such file or directory")

MariaDB [MidSchipDB_unstable]> SHOW CREATE TABLE db_history \G

       Table: db_history

Create Table: CREATE TABLE `db_history` (

  `version` varchar(10) NOT NULL,

  `updateJSON` mediumtext,

  `prevVersion` varchar(10) NOT NULL,

  `nodeID` bigint(20) unsigned NOT NULL DEFAULT '0',

  `prevNodeID` bigint(20) unsigned NOT NULL DEFAULT '0',

  PRIMARY KEY (`prevNodeID`,`nodeID`),

  KEY `prevVersion` (`prevVersion`) USING BTREE,

  KEY `version` (`version`) USING BTREE,

  KEY `nodeID` (`nodeID`)

) ENGINE=MyISAM DEFAULT CHARSET=utf8

1 row in set (0.00 sec)

MariaDB [MidSchipDB_unstable]> SELECT COUNT(*) FROM db_history;

+----------+

| COUNT(*) |

+----------+

|      129 |

+----------+

1 row in set (0.00 sec)

MariaDB [MidSchipDB_unstable]> CREATE TABLE IF NOT EXISTS version_history (

    ->     latch VARCHAR(32) NULL,

    ->     origid BIGINT UNSIGNED NULL,

    ->     destid BIGINT UNSIGNED NULL,

    ->     weight DOUBLE NULL,

    ->     seq BIGINT UNSIGNED NULL,

    ->     linkid BIGINT UNSIGNED NULL,

    ->     KEY (latch, origid, destid) USING HASH,

    ->     KEY (latch, destid, origid) USING HASH

    -> ) ENGINE=OQGRAPH

    ->   data_table='db_history'

    ->   origid='prevNodeID'

    ->   destid='nodeID';

Query OK, 0 rows affected (0.01 sec)