diff --git a/frontend/src/components/map/InstitutionInfoPanel.tsx b/frontend/src/components/map/InstitutionInfoPanel.tsx
index ba5531171a..5e8075bb6b 100644
--- a/frontend/src/components/map/InstitutionInfoPanel.tsx
+++ b/frontend/src/components/map/InstitutionInfoPanel.tsx
@@ -294,20 +294,20 @@ export interface Institution {
   successor_organization?: SuccessorOrganization;
   genealogiewerkbalk?: {
     municipality?: {
-      name: string;
-      code: string;
+      name?: string;
+      code?: string;
     };
     municipal_archive?: {
-      name: string;
+      name?: string;
       website?: string;
       isil?: string;
     };
     province?: {
-      name: string;
-      code: string;
+      name?: string;
+      code?: string;
     };
     provincial_archive?: {
-      name: string;
+      name?: string;
       website?: string;
     };
     match_confidence?: number;