leanengine 0.1.5

TypeError: Cannot assign to read only property '$ne' of true
   at Object.AV.Query.addCondition (/home/thream/Work/demo/nodemodules/leanengine/node_modules/avoscloud-sdk/lib/query.js:392:35)
   at Object.AV.Query.notEqualTo (/home/thream/Work/demo/node_modules/leanengine/node_modules/avoscloud-sdk/lib/query.js:415:12)
   at inferQuery

触发该问题的代码是:
query.notEqualTo('enabled', false);