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dify - 💡(How to fix) Fix fetch memory of LLM node may cause out of flask context [1 pull requests]

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Error Message

2026-05-16 13:10:20,322 ERROR [graph.py:163] Failed to create node instance for node_id 1778936649563 Traceback (most recent call last): File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/graphon/graph/graph.py", line 161, in _create_node_instances node_instance = node_factory.create_node(node_config) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 444, in create_node node_init_kwargs = node_init_kwargs_factories.get(node_type, lambda: {})() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 399, in <lambda> BuiltinNodeTypes.LLM: lambda: self._build_llm_compatible_node_init_kwargs( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 486, in _build_llm_compatible_node_init_kwargs "memory": self._build_memory_for_llm_node( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 561, in _build_memory_for_llm_node return fetch_memory( ^^^^^^^^^^^^^ File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 235, in fetch_memory with Session(db.engine, expire_on_commit=False) as session: ^^^^^^^^^ File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/flask_sqlalchemy/extension.py", line 709, in engine return self.engines[None] ^^^^^^^^^^^^ File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/flask_sqlalchemy/extension.py", line 687, in engines app = current_app._get_current_object() # type: ignore[attr-defined] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/werkzeug/local.py", line 519, in _get_current_object raise RuntimeError(unbound_message) from None RuntimeError: Working outside of application context.

This typically means that you attempted to use functionality that needed the current application. To solve this, set up an application context with app.app_context(). See the documentation for more information.

Fix Action

Fixed

Code Example

2026-05-16 13:10:20,322 ERROR [graph.py:163]  Failed to create node instance for node_id 1778936649563
Traceback (most recent call last):
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/graphon/graph/graph.py", line 161, in _create_node_instances
    node_instance = node_factory.create_node(node_config)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 444, in create_node
    node_init_kwargs = node_init_kwargs_factories.get(node_type, lambda: {})()
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 399, in <lambda>
    BuiltinNodeTypes.LLM: lambda: self._build_llm_compatible_node_init_kwargs(
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 486, in _build_llm_compatible_node_init_kwargs
    "memory": self._build_memory_for_llm_node(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 561, in _build_memory_for_llm_node
    return fetch_memory(
           ^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 235, in fetch_memory
    with Session(db.engine, expire_on_commit=False) as session:
                 ^^^^^^^^^
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/flask_sqlalchemy/extension.py", line 709, in engine
    return self.engines[None]
           ^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/flask_sqlalchemy/extension.py", line 687, in engines
    app = current_app._get_current_object()  # type: ignore[attr-defined]
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/werkzeug/local.py", line 519, in _get_current_object
    raise RuntimeError(unbound_message) from None
RuntimeError: Working outside of application context.

This typically means that you attempted to use functionality that needed
the current application. To solve this, set up an application context
with app.app_context(). See the documentation for more information.
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Dify version

1.4.1

Cloud or Self Hosted

Self Hosted (Source)

Steps to reproduce

error log:

2026-05-16 13:10:20,322 ERROR [graph.py:163]  Failed to create node instance for node_id 1778936649563
Traceback (most recent call last):
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/graphon/graph/graph.py", line 161, in _create_node_instances
    node_instance = node_factory.create_node(node_config)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 444, in create_node
    node_init_kwargs = node_init_kwargs_factories.get(node_type, lambda: {})()
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 399, in <lambda>
    BuiltinNodeTypes.LLM: lambda: self._build_llm_compatible_node_init_kwargs(
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 486, in _build_llm_compatible_node_init_kwargs
    "memory": self._build_memory_for_llm_node(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 561, in _build_memory_for_llm_node
    return fetch_memory(
           ^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/core/workflow/node_factory.py", line 235, in fetch_memory
    with Session(db.engine, expire_on_commit=False) as session:
                 ^^^^^^^^^
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/flask_sqlalchemy/extension.py", line 709, in engine
    return self.engines[None]
           ^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/flask_sqlalchemy/extension.py", line 687, in engines
    app = current_app._get_current_object()  # type: ignore[attr-defined]
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/hejl/projects/dify/api/.venv/lib/python3.12/site-packages/werkzeug/local.py", line 519, in _get_current_object
    raise RuntimeError(unbound_message) from None
RuntimeError: Working outside of application context.

This typically means that you attempted to use functionality that needed
the current application. To solve this, set up an application context
with app.app_context(). See the documentation for more information.
<img width="1384" height="926" alt="Image" src="https://github.com/user-attachments/assets/1ce7fa7d-2a08-4897-ae9c-4309e1ec1ffc" />

minimal reproduce DSL: aa (1).yml

a first LLM node with memory open, and then connect a iteration node with parallel mode and contains another LLM node can raise this exception.

✔️ Expected Behavior

not raise exception

❌ Actual Behavior

No response

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dify - 💡(How to fix) Fix fetch memory of LLM node may cause out of flask context [1 pull requests]