diff --git a/substrate/frame/session/src/lib.rs b/substrate/frame/session/src/lib.rs
index ce924f1400..d9d5c81e8a 100644
--- a/substrate/frame/session/src/lib.rs
+++ b/substrate/frame/session/src/lib.rs
@@ -442,7 +442,11 @@ decl_storage! {
 			for (account, val, keys) in config.keys.iter().cloned() {
 				<Module<T>>::inner_set_keys(&val, keys)
 					.expect("genesis config must not contain duplicates; qed");
-				assert!(frame_system::Pallet::<T>::inc_consumers(&account).is_ok());
+				assert!(
+					frame_system::Pallet::<T>::inc_consumers(&account).is_ok(),
+					"Account ({:?}) does not exist at genesis to set key. Account not endowed?",
+					account,
+				);
 			}
 
 			let initial_validators_0 = T::SessionManager::new_session(0)