diff --git a/src/services/group-sync.ts b/src/services/group-sync.ts
index d1cfa63..18b094c 100644
--- a/src/services/group-sync.ts
+++ b/src/services/group-sync.ts
@@ -291,10 +291,12 @@ export class GroupSyncService {
 	}
 
 	private static cacheActiveGroups(): void {
-		const groups = this.dbInstance.prepare('SELECT id, name FROM groups WHERE active = TRUE AND COALESCE(is_community,0) = 0 AND COALESCE(archived,0) = 0').all();
+		const groups = this.dbInstance
+			.prepare('SELECT id, name FROM groups WHERE active = TRUE AND COALESCE(is_community,0) = 0 AND COALESCE(archived,0) = 0')
+			.all() as Array<{ id: string; name: string | null }>;
 		this.activeGroupsCache.clear();
 		for (const group of groups) {
-			this.activeGroupsCache.set(group.id, group.name);
+			this.activeGroupsCache.set(String(group.id), String(group.name ?? ''));
 		}
 		console.log(`Cached ${this.activeGroupsCache.size} active groups`);
 	}