diff --git a/packages/api-derive/src/staking/query.ts b/packages/api-derive/src/staking/query.ts
index b402ce9ed2..860fbd2aa5 100644
--- a/packages/api-derive/src/staking/query.ts
+++ b/packages/api-derive/src/staking/query.ts
@@ -46,7 +46,7 @@ function retrieveCurr (api: ApiInterfaceRx, stashId: AccountId): Observable<Mult
         [api.query.staking.nominators, stashId],
         [api.query.staking.payee, stashId],
         [api.query.staking.validators, stashId],
-        api.consts.session.dedupKeyPrefix
+        api.consts.session?.dedupKeyPrefix
           ? [api.query.session.nextKeys, [api.consts.session.dedupKeyPrefix, stashId]]
           : [api.query.session.nextKeys, stashId],
         [api.query.staking.erasStakers, [activeEra, stashId]]