diff --git a/api/core/workflow/workflow_entry.py b/api/core/workflow/workflow_entry.py
index 49645ff120..3801dfe15d 100644
--- a/api/core/workflow/workflow_entry.py
+++ b/api/core/workflow/workflow_entry.py
@@ -416,4 +416,8 @@ class WorkflowEntry:
 
             # append variable and value to variable pool
             if variable_node_id != ENVIRONMENT_VARIABLE_NODE_ID:
+                # In single run, the input_value is set as the LLM's structured output value within the variable_pool.
+                if len(variable_key_list) == 2 and variable_key_list[0] == "structured_output":
+                    input_value = {variable_key_list[1]: input_value}
+                    variable_key_list = variable_key_list[0:1]
                 variable_pool.add([variable_node_id] + variable_key_list, input_value)