Abstract type "TravelTips" must resolve to an Object type at runtime for field "Query.travelTipBySlug". Either the "TravelTips" type should provide a "resolveType" function or each possible type should provide an "isTypeOf" function.
This is the famous yellow river braid on the south coast of Iceland. It's easy to get to but please do respect the private land of farmers and be careful where you launch your drone from.
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