From 5459d812e7bb473ed4849aeee3ed2c8a26c8ea1d Mon Sep 17 00:00:00 2001
From: -LAN- <laipz8200@outlook.com>
Date: Mon, 21 Oct 2024 20:16:46 +0800
Subject: [PATCH] fix(iteration): handle empty iterator gracefully (#9565)

---
 api/core/workflow/nodes/iteration/iteration_node.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/api/core/workflow/nodes/iteration/iteration_node.py b/api/core/workflow/nodes/iteration/iteration_node.py
index b28ae0a85c..7503c13ce8 100644
--- a/api/core/workflow/nodes/iteration/iteration_node.py
+++ b/api/core/workflow/nodes/iteration/iteration_node.py
@@ -46,6 +46,15 @@ class IterationNode(BaseNode[IterationNodeData]):
         if not iterator_list_segment:
             raise ValueError(f"Iterator variable {self.node_data.iterator_selector} not found")
 
+        if len(iterator_list_segment.value) == 0:
+            yield RunCompletedEvent(
+                run_result=NodeRunResult(
+                    status=WorkflowNodeExecutionStatus.SUCCEEDED,
+                    outputs={"output": []},
+                )
+            )
+            return
+
         iterator_list_value = iterator_list_segment.to_object()
 
         if not isinstance(iterator_list_value, list):