From 6d47fd2823e28e29765e85920d6a25a322393cad Mon Sep 17 00:00:00 2001
From: zyxxoo <1318247699@qq.com>
Date: Tue, 11 Jan 2022 17:54:03 +0800
Subject: [PATCH] fix: core test

---
 .../com/baidu/hugegraph/traversal/optimize/TraversalUtil.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/optimize/TraversalUtil.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/optimize/TraversalUtil.java
index e9d9c49c54..c09b5cdb6b 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/optimize/TraversalUtil.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/optimize/TraversalUtil.java
@@ -30,6 +30,7 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import com.google.common.collect.Collections2;
 import org.apache.tinkerpop.gremlin.process.traversal.Compare;
 import org.apache.tinkerpop.gremlin.process.traversal.Contains;
 import org.apache.tinkerpop.gremlin.process.traversal.Order;
@@ -571,6 +572,9 @@ public static void convAllHasSteps(Traversal.Admin<?, ?> traversal) {
         List<HasStep> steps =
                       TraversalHelper.getStepsOfAssignableClassRecursively(
                       HasStep.class, traversal);
+        if (steps.isEmpty() || !traversal.getGraph().isPresent()) {
+            return;
+        }
         HugeGraph graph = (HugeGraph) traversal.getGraph().get();
         for (HasStep<?> step : steps) {
             TraversalUtil.convHasStep(graph, step);