diff --git a/tests/integration/helpers/postgres_utility.py b/tests/integration/helpers/postgres_utility.py
index ba6ec1fd66e..6a91c41154a 100644
--- a/tests/integration/helpers/postgres_utility.py
+++ b/tests/integration/helpers/postgres_utility.py
@@ -343,16 +343,22 @@ def assert_nested_table_is_created(
         table = schema_name + "." + table_name
 
     print(f"Checking table {table} exists in {materialized_database}")
+
+    # Check based on `system.tables` is not enough, because tables appear there before they are loaded.
+    # It may lead to error `Unknown table expression identifier...`
+    while True:
+        try:
+            instance.query(
+                f"SELECT * FROM `{materialized_database}`.`{table}` LIMIT 1 FORMAT Null"
+            )
+            break
+        except Exception:
+            time.sleep(0.2)
+            continue
+
     database_tables = instance.query(
         f"SHOW TABLES FROM `{materialized_database}` WHERE name = '{table}'"
     )
-
-    while table not in database_tables:
-        time.sleep(0.2)
-        database_tables = instance.query(
-            f"SHOW TABLES FROM `{materialized_database}` WHERE name = '{table}'"
-        )
-
     assert table in database_tables