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Warning: .then() only accepts functions but was passed: [object Null], [object Null]

See original GitHub issue

Hi I use angular with bluebird for promises. Decorating default angular’s $q: $provide.decorator("$q", function(){...}); When i call the service Upload.upload() then a warning is issued in the console:

Warning: .then() only accepts functions but was passed: [object Null], [object Null]
    at Promise.ngFileUpload.service.promise.progress (webpack:///./src/main/webapp/bower_components/ng-file-upload/ng-file-upload.js?:92:15)
    at uploadFile (webpack:///./src/main/webapp/app/scripts/orm/lib/ui/field/objects/objects.js?:277:12)
    at Scope.angular.module.controller.$scope.upload (webpack:///./src/main/webapp/app/scripts/orm/lib/ui/field/objects/objects.js?:258:13)
    at Object.eval [as fn] (webpack:///./src/main/webapp/app/scripts/orm/lib/ui/field/objects/objects.js?:324:16)
    at Scope.$get.Scope.$digest (webpack:///./src/main/webapp/bower_components/angular/dist/angular.js?./~/exports-loader?window.angular:14537:29)
    at Scope.$get.Scope.$apply (webpack:///./src/main/webapp/bower_components/angular/dist/angular.js?./~/exports-loader?window.angular:14800:24)
    at eval (webpack:///./src/main/webapp/bower_components/angular/dist/angular.js?./~/exports-loader?window.angular:16537:36)
    at completeOutstandingRequest (webpack:///./src/main/webapp/bower_components/angular/dist/angular.js?./~/exports-loader?window.angular:5153:10)
    at eval (webpack:///./src/main/webapp/bower_components/angular/dist/angular.js?./~/exports-loader?window.angular:5541:7)

Everything is normal or not? ngFileUpload version 5.0.6