diff --git a/apps/application/flow/step_node/function_lib_node/impl/base_function_lib_node.py b/apps/application/flow/step_node/function_lib_node/impl/base_function_lib_node.py
index 3ae9f7b898d..64e1c556eb9 100644
--- a/apps/application/flow/step_node/function_lib_node/impl/base_function_lib_node.py
+++ b/apps/application/flow/step_node/function_lib_node/impl/base_function_lib_node.py
@@ -62,6 +62,8 @@ def valid_reference_value(_type, value, name):
 def convert_value(name: str, value, _type, is_required, source, node):
     if not is_required and value is None:
         return None
+    if not is_required and source == 'reference' and (value is None or len(value) == 0):
+        return None
     if source == 'reference':
         value = node.workflow_manage.get_reference_field(
             value[0],