sequelize 无缘无故报了这样一个错，但是还能正常用，请问如何解决？

Unhandled rejection TypeError: this._length.toLowerCase is not a function at TEXT.toSql (C:\Project\wxApi\APIforDoctorWorkstation\node_modules\sequeli ze\lib\data-types.js:93:24) at TEXT.toString (C:\Project\wxApi\APIforDoctorWorkstation\node_modules\sequ elize\lib\data-types.js:19:15) at Object.attributeToSQL (C:\Project\wxApi\APIforDoctorWorkstation\node_modu les\sequelize\lib\dialects\mysql\query-generator.js:320:44) at Object.attributesToSQL (C:\Project\wxApi\APIforDoctorWorkstation\node_mod ules\sequelize\lib\dialects\mysql\query-generator.js:385:45) at QueryInterface.createTable (C:\Project\wxApi\APIforDoctorWorkstation\node _modules\sequelize\lib\query-interface.js:274:40) at Promise.try.then.then (C:\Project\wxApi\APIforDoctorWorkstation\node_modu les\sequelize\lib\model.js:1128:39) at tryCatcher (C:\Project\wxApi\APIforDoctorWorkstation\node_modules\bluebir d\js\release\util.js:16:23) at Promise._settlePromiseFromHandler (C:\Project\wxApi\APIforDoctorWorkstati on\node_modules\bluebird\js\release\promise.js:512:31) at Promise._settlePromise (C:\Project\wxApi\APIforDoctorWorkstation\node_mod ules\bluebird\js\release\promise.js:569:18) at Promise._settlePromise0 (C:\Project\wxApi\APIforDoctorWorkstation\node_mo dules\bluebird\js\release\promise.js:614:10) at Promise._settlePromises (C:\Project\wxApi\APIforDoctorWorkstation\node_mo dules\bluebird\js\release\promise.js:693:18) at Async._drainQueue (C:\Project\wxApi\APIforDoctorWorkstation\node_modules
bluebird\js\release\async.js:133:16) at Async._drainQueues (C:\Project\wxApi\APIforDoctorWorkstation\node_modules \bluebird\js\release\async.js:143:10) at Immediate.Async.drainQueues (C:\Project\wxApi\APIforDoctorWorkstation\nod e_modules\bluebird\js\release\async.js:17:14) at runCallback (timers.js:810:20) at tryOnImmediate (timers.js:768:5) at processImmediate [as _immediateCallback] (timers.js:745:5)