diff --git a/src/lib/stores/ae_events_stores__badges.svelte.ts b/src/lib/stores/ae_events_stores__badges.svelte.ts
index e7cb7af8..968ff229 100644
--- a/src/lib/stores/ae_events_stores__badges.svelte.ts
+++ b/src/lib/stores/ae_events_stores__badges.svelte.ts
@@ -15,4 +15,11 @@
 import { PersistedState } from 'runed';
 import { badges_loc_defaults } from './ae_events_stores__badges_defaults';
 
-export const badges_loc = new PersistedState('ae_badges_loc', badges_loc_defaults);
+// Custom deserializer merges stored JSON with defaults so that new fields added
+// after a user's first session get their default values rather than undefined.
+export const badges_loc = new PersistedState('ae_badges_loc', badges_loc_defaults, {
+    serializer: {
+        serialize: JSON.stringify,
+        deserialize: (raw: string) => ({ ...badges_loc_defaults, ...JSON.parse(raw) })
+    }
+});
diff --git a/src/lib/stores/ae_events_stores__leads.svelte.ts b/src/lib/stores/ae_events_stores__leads.svelte.ts
index 33625fe8..d23d2388 100644
--- a/src/lib/stores/ae_events_stores__leads.svelte.ts
+++ b/src/lib/stores/ae_events_stores__leads.svelte.ts
@@ -18,4 +18,9 @@
 import { PersistedState } from 'runed';
 import { leads_loc_defaults } from './ae_events_stores__leads_defaults';
 
-export const leads_loc = new PersistedState('ae_leads_loc', leads_loc_defaults);
+export const leads_loc = new PersistedState('ae_leads_loc', leads_loc_defaults, {
+    serializer: {
+        serialize: JSON.stringify,
+        deserialize: (raw: string) => ({ ...leads_loc_defaults, ...JSON.parse(raw) })
+    }
+});
diff --git a/src/lib/stores/ae_events_stores__pres_mgmt.svelte.ts b/src/lib/stores/ae_events_stores__pres_mgmt.svelte.ts
index 67815c12..3694a587 100644
--- a/src/lib/stores/ae_events_stores__pres_mgmt.svelte.ts
+++ b/src/lib/stores/ae_events_stores__pres_mgmt.svelte.ts
@@ -15,4 +15,9 @@
 import { PersistedState } from 'runed';
 import { pres_mgmt_loc_defaults } from './ae_events_stores__pres_mgmt_defaults';
 
-export const pres_mgmt_loc = new PersistedState('ae_pres_mgmt_loc', pres_mgmt_loc_defaults);
+export const pres_mgmt_loc = new PersistedState('ae_pres_mgmt_loc', pres_mgmt_loc_defaults, {
+    serializer: {
+        serialize: JSON.stringify,
+        deserialize: (raw: string) => ({ ...pres_mgmt_loc_defaults, ...JSON.parse(raw) })
+    }
+});