diff --git a/types/mobx-apollo/index.d.ts b/types/mobx-apollo/index.d.ts
index 4054601717..54818cd846 100644
--- a/types/mobx-apollo/index.d.ts
+++ b/types/mobx-apollo/index.d.ts
@@ -19,7 +19,7 @@ export interface MobxApolloQueryOptions<T> extends WatchQueryOptions {
 
 export interface MobxApolloQuery<T> {
     loading: boolean;
-    data: T;
+    data?: T;
     error?: ApolloError;
     ref: ObservableQuery<T>;
 }
diff --git a/types/mobx-apollo/mobx-apollo-tests.ts b/types/mobx-apollo/mobx-apollo-tests.ts
index 964e6b0c6e..50d6b03abb 100644
--- a/types/mobx-apollo/mobx-apollo-tests.ts
+++ b/types/mobx-apollo/mobx-apollo-tests.ts
@@ -27,7 +27,7 @@ class PostStore {
     }
 
     get posts() {
-        return this.postsQuery.data.posts;
+        return this.postsQuery.data && this.postsQuery.data.posts;
     }
 }