diff --git a/src/reducers/dataReducer.js b/src/reducers/dataReducer.js
index 9fc093ac..c3fd4a4d 100644
--- a/src/reducers/dataReducer.js
+++ b/src/reducers/dataReducer.js
@@ -60,7 +60,7 @@ export default function dataReducer(state = {}, action) {
         );
       }
       // Otherwise merge with existing data
-      const mergedData = assign(previousData, data);
+      const mergedData = payload.data !== null ? assign(previousData, data) : null;
       // Set data to state (with merge) immutabily (lodash/fp's setWith creates copy)
       return setWith(
         Object,