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Having a hard time debugging this one. Using jQuery UI Droppable in a Backbone application using CoffeeScript. There is nothing wrong with the functionality, everything is working how I intended it to, but I am still getting this console error every time an item is dropped. Uncaught TypeError: Cannot read property 'options' of undefined Code for the droppable: @$el.droppable tolerance: 'pointer' hoverClass: 'drop_hover' accept: '.item' drop: (e, ui) => draggedItem = ui.draggable itemId = draggedItem.attr 'data-id' allInstances = @model.collection.models findItems = for instance in allInstances instanceItems = instance.get 'items' instanceItems.getByCid itemId compacted = _.compact findItems droppedItem = compacted[0] droppedCollection = droppedItem.collection droppedCollection.remove droppedItem if _.include droppedCollection.models, droppedItem @itemCollection.add droppedItem unless _.include @items, droppedItem Like I said the functionality is working properly, I just would like to get rid of the error if someone knows anything I could try to debug. Stack Trace Uncaught TypeError: Cannot read property 'options' of undefined a.ui.plugin.add.stopjquery-ui.js:49 a.ui.version.a.extend.plugin.call jquery-ui.js:9 a.widget._trigger jquery-ui.js:49 a.widget._mouseStop jquery-ui.js:49 a.widget._mouseUp jquery-ui.js:28 a.widget._mouseUp jquery-ui.js:49 a.widget._mouseDown._mouseUpDelegate jquery-ui.js:28 f.event.dispatch jquery-1.7.1.min.js:3 f.event.add.h.handle.i jquery-1.7.1.min.js:3 Thanks for any help.

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