diff --git a/kyuubi-server/src/main/scala/org/apache/kyuubi/client/KyuubiSyncThriftClient.scala b/kyuubi-server/src/main/scala/org/apache/kyuubi/client/KyuubiSyncThriftClient.scala
index 9f61021b013..3516c3771aa 100644
--- a/kyuubi-server/src/main/scala/org/apache/kyuubi/client/KyuubiSyncThriftClient.scala
+++ b/kyuubi-server/src/main/scala/org/apache/kyuubi/client/KyuubiSyncThriftClient.scala
@@ -99,10 +99,11 @@ class KyuubiSyncThriftClient private (
               remoteEngineBroken = false
             } catch {
               case e: Throwable =>
-                warn(s"The engine[$engineId] alive probe fails", e)
+                val engineIdStr = engineId.getOrElse("")
+                warn(s"The engine[$engineIdStr] alive probe fails", e)
                 val now = System.currentTimeMillis()
                 if (now - engineLastAlive > engineAliveTimeout) {
-                  error(s"Mark the engine[$engineId] not alive with no recent alive probe" +
+                  error(s"Mark the engine[$engineIdStr] not alive with no recent alive probe" +
                     s" success: ${now - engineLastAlive} ms exceeds timeout $engineAliveTimeout ms")
                   remoteEngineBroken = true
                 }