No protocol method IDeref.-deref defined for type om.core/MapCursor

I was following along David Nolen's Om tutorial and found a curious error. When I got to the part where the delete buttons weren't supposed to work, they worked just fine. Adding the derefing to contacts resulted in:

Uncaught Error: No protocol method IDeref.-deref defined for type om.core/MapCursor: [object Object]

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