diff --git a/src/reducers/dataReducer.js b/src/reducers/dataReducer.js
index ebfb442d..fc345334 100644
--- a/src/reducers/dataReducer.js
+++ b/src/reducers/dataReducer.js
@@ -1,5 +1,5 @@
 import { get } from 'lodash';
-import { setWith } from 'lodash/fp';
+import { setWith, assign } from 'lodash/fp';
 import { actionTypes } from '../constants';
 import { pathFromMeta, preserveValuesFromState } from '../utils/reducers';
 
@@ -59,11 +59,13 @@ export default function dataReducer(state = {}, action) {
           state,
         );
       }
+      // Otherwise merge with existing data
+      const mergedData = assign(previousData, data);
       // Set data to state (with merge) immutabily (lodash/fp's setWith creates copy)
       return setWith(
         Object,
         meta.storeAs ? [meta.storeAs] : pathFromMeta(meta),
-        data,
+        mergedData,
         state,
       );
     case DOCUMENT_MODIFIED:
diff --git a/test/unit/reducers/dataReducer.spec.js b/test/unit/reducers/dataReducer.spec.js
index 712a8878..20d02d27 100644
--- a/test/unit/reducers/dataReducer.spec.js
+++ b/test/unit/reducers/dataReducer.spec.js
@@ -88,7 +88,7 @@ describe('dataReducer', () => {
           `${collection}.${doc}.newData.field`,
           data[doc].newData.field,
         );
-        expect(result).to.not.have.nested.property(
+        expect(result).to.have.nested.property(
           `${collection}.${doc}.originalData.some.val`,
           existingState[collection][doc].originalData.some.val,
         );