diff --git a/lib/model/query/audits.js b/lib/model/query/audits.js
index 8b3ee36c7..4efe20450 100644
--- a/lib/model/query/audits.js
+++ b/lib/model/query/audits.js
@@ -214,7 +214,7 @@ const getByEntityId = (entityId, options) => ({ all }) => {
 
       const details = mergeLeft(audit.details, sourceEvent
         .map(event => ({ source: { event, submission } }))
-        .orElse(undefined));
+        .orElse({ source: {} })); // Add default empty source to all other entity audit events
 
       return new Audit({ ...audit, details }, { actor: audit.aux.actor });
     }));
diff --git a/test/integration/api/entities.js b/test/integration/api/entities.js
index 21a27a281..e1807055b 100644
--- a/test/integration/api/entities.js
+++ b/test/integration/api/entities.js
@@ -854,6 +854,7 @@ describe('Entities API', () => {
           logs[1].action.should.be.eql('entity.update.version');
           logs[1].details.entity.uuid.should.be.eql('12345678-1234-4123-8234-123456789abc');
           logs[1].actor.displayName.should.be.eql('Bob');
+          logs[1].details.source.should.be.eql({});
 
           logs[2].should.be.an.Audit();
           logs[2].action.should.be.eql('entity.create');
@@ -942,7 +943,7 @@ describe('Entities API', () => {
         await asAlice.get('/v1/projects/1/datasets/people/entities/12345678-1234-4123-8234-123456789abc/audits')
           .expect(200)
           .then(({ body: logs }) => {
-            logs[0].details.should.not.have.property('source');
+            logs[0].details.source.should.eql({});
           });
 
         await asAlice.patch('/v1/projects/1/datasets/people/entities/12345678-1234-4123-8234-123456789abc?force=true')
@@ -952,7 +953,7 @@ describe('Entities API', () => {
         await asAlice.get('/v1/projects/1/datasets/people/entities/12345678-1234-4123-8234-123456789abc/audits')
           .expect(200)
           .then(({ body: logs }) => {
-            logs[0].details.should.not.have.property('source');
+            logs[0].details.source.should.eql({});
           });
       }));