diff --git a/test/suites/zombie_tanssi_relay_eth_bridge/test_zombie_tanssi_relay_eth_bridge.ts b/test/suites/zombie_tanssi_relay_eth_bridge/test_zombie_tanssi_relay_eth_bridge.ts
index 5726e06f0..2aa884890 100644
--- a/test/suites/zombie_tanssi_relay_eth_bridge/test_zombie_tanssi_relay_eth_bridge.ts
+++ b/test/suites/zombie_tanssi_relay_eth_bridge/test_zombie_tanssi_relay_eth_bridge.ts
@@ -318,7 +318,7 @@ describeSuite({
                 for (let i = 0; i < 3 * blocksPerSession; ++i) {
                     const latestBlockHash = await relayApi.rpc.chain.getBlockHash();
                     const author = (await relayApi.derive.chain.getHeader(latestBlockHash)).author;
-                    if (author.toString() === operatorAccount.address) {
+                    if (author?.toString() === operatorAccount.address) {
                         return;
                     }
                     await context.waitBlock(1, "Tanssi-relay");