Mysql error "Unknown column 'mempool_object' in 'field list"

We see many error messages at our mysql server like the message below:

Error during query on (40,tools-db-master,3306,99335547) , user "tools_observium_rw@10.106.36.186" , schema "observium" , 1054, Unknown column 'mempool_object' in 'field list' . digest_text = "INSERT INTO `mempools` (`device_id`,`mempool_index`,`mempool_mib`,`mempool_descr`,`mempool_multiplier`,`mempool_hc`,`mempool_object`,`mempool_total`,`mempool_used`,`mempool_free`,`mempool_perc`,`mempool_polled`) VALUES (?,?,?,...)"