vatsrahul1001 opened a new issue, #55826:
URL: https://github.com/apache/airflow/issues/55826
### Apache Airflow version
main (development)
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
Migrated from 2.11 with existing variables, throwing http 500 in api server
**API SERVER logs **
```
ERROR: Exception in ASGI application
Traceback (most recent call last):
File
"/usr/python/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 409, in run_asgi
result = await app( # type: ignore[func-returns-value]
File "/usr/python/lib/python3.10/site-packages/fastapi/applications.py",
line 1054, in __call__
await super().__call__(scope, receive, send)
File "/usr/python/lib/python3.10/site-packages/starlette/applications.py",
line 113, in __call__
await self.middleware_stack(scope, receive, send)
File
"/usr/python/lib/python3.10/site-packages/starlette/middleware/errors.py", line
186, in __call__
raise exc
File
"/usr/python/lib/python3.10/site-packages/starlette/middleware/errors.py", line
164, in __call__
await self.app(scope, receive, _send)
File
"/usr/python/lib/python3.10/site-packages/starlette/middleware/gzip.py", line
29, in __call__
await responder(scope, receive, send)
File
"/usr/python/lib/python3.10/site-packages/starlette/middleware/gzip.py", line
130, in __call__
await super().__call__(scope, receive, send)
File
"/usr/python/lib/python3.10/site-packages/starlette/middleware/gzip.py", line
46, in __call__
await self.app(scope, receive, self.send_with_compression)
File
"/usr/python/lib/python3.10/site-packages/starlette/middleware/cors.py", line
85, in __call__
await self.app(scope, receive, send)
File
"/usr/python/lib/python3.10/site-packages/starlette/middleware/exceptions.py",
line 63, in __call__
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File
"/usr/python/lib/python3.10/site-packages/starlette/_exception_handler.py",
line 53, in wrapped_app
raise exc
File
"/usr/python/lib/python3.10/site-packages/starlette/_exception_handler.py",
line 42, in wrapped_app
await app(scope, receive, sender)
File "/usr/python/lib/python3.10/site-packages/starlette/routing.py", line
716, in __call__
await self.middleware_stack(scope, receive, send)
File "/usr/python/lib/python3.10/site-packages/starlette/routing.py", line
736, in app
await route.handle(scope, receive, send)
File "/usr/python/lib/python3.10/site-packages/starlette/routing.py", line
290, in handle
await self.app(scope, receive, send)
File "/usr/python/lib/python3.10/site-packages/starlette/routing.py", line
78, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File
"/usr/python/lib/python3.10/site-packages/starlette/_exception_handler.py",
line 53, in wrapped_app
raise exc
File
"/usr/python/lib/python3.10/site-packages/starlette/_exception_handler.py",
line 42, in wrapped_app
await app(scope, receive, sender)
File "/usr/python/lib/python3.10/site-packages/starlette/routing.py", line
75, in app
response = await f(request)
File "/usr/python/lib/python3.10/site-packages/fastapi/routing.py", line
302, in app
raw_response = await run_endpoint_function(
File "/usr/python/lib/python3.10/site-packages/fastapi/routing.py", line
215, in run_endpoint_function
return await run_in_threadpool(dependant.call, **values)
File "/usr/python/lib/python3.10/site-packages/starlette/concurrency.py",
line 38, in run_in_threadpool
return await anyio.to_thread.run_sync(func)
File "/usr/python/lib/python3.10/site-packages/anyio/to_thread.py", line
56, in run_sync
return await get_async_backend().run_sync_in_worker_thread(
File
"/usr/python/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line
2476, in run_sync_in_worker_thread
return await future
File
"/usr/python/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line
967, in run
result = context.run(func, *args)
File
"/opt/airflow/airflow-core/src/airflow/api_fastapi/core_api/routes/public/variables.py",
line 117, in get_variables
return VariableCollectionResponse(
File "/usr/python/lib/python3.10/site-packages/pydantic/main.py", line
253, in __init__
validated_self = self.__pydantic_validator__.validate_python(data,
self_instance=self)
pydantic_core._pydantic_core.ValidationError: 1 validation error for
VariableCollectionResponse
variables.0.val
Input should be a valid string [type=string_type, input_value=None,
input_type=NoneType]
For further information visit
https://errors.pydantic.dev/2.11/v/string_type
```
### What you think should happen instead?
_No response_
### How to reproduce
1. Create connections is with 2.11 version.
2. Migrate to 3.1.0b2
3. Try accessing the variables page
4. check API server logs
### Operating System
Linux
### Versions of Apache Airflow Providers
_No response_
### Deployment
Official Apache Airflow Helm Chart
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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