diff --git a/tests/unit/e_db_pdoTest.php b/tests/unit/e_db_pdoTest.php
index 7a9434b8f..fe8c88583 100644
--- a/tests/unit/e_db_pdoTest.php
+++ b/tests/unit/e_db_pdoTest.php
@@ -790,6 +790,9 @@
 
 			$list = $this->db->db_TableList('lan');
 			$this->assertEmpty($list);
+
+			$list = $this->db->db_TableList('invalid');
+			$this->assertEmpty($list);
 		}
 
 		public function testTables()