diff --git a/jslib b/jslib
index 0092aac2..2858724f 160000
--- a/jslib
+++ b/jslib
@@ -1 +1 @@
-Subproject commit 0092aac275e8efca66838a8c266eec1d455883aa
+Subproject commit 2858724f4431038be190fc0b748efe287dd1bae6
diff --git a/src/services/sync.service.ts b/src/services/sync.service.ts
index 7de79fac..ef2579c4 100644
--- a/src/services/sync.service.ts
+++ b/src/services/sync.service.ts
@@ -104,11 +104,14 @@ export class SyncService {
     }
 
     private filterUnsupportedUsers(users: UserEntry[]): UserEntry[] {
-        return users.filter((u) => u.email == null || u.email.length <= 50);
+        return users == null ? null : users.filter((u) => u.email == null || u.email.length <= 50);
     }
 
     private flattenUsersToGroups(levelGroups: GroupEntry[], allGroups: GroupEntry[]): Set<string> {
         let allUsers = new Set<string>();
+        if (allGroups == null) {
+            return allUsers;
+        }
         for (const group of levelGroups) {
             const childGroups = allGroups.filter((g) => group.groupMemberReferenceIds.has(g.referenceId));
             const childUsers = this.flattenUsersToGroups(childGroups, allGroups);