fix: sse error message

api/core/plugin/backwards_invocation/base.py

@@ -11,13 +11,10 @@ class BaseBackwardsInvocation:
         if isinstance(response, Generator):
             try:
                 for chunk in response:
-                    if isinstance(chunk, BaseModel):
+                    if isinstance(chunk, BaseModel | dict):
                         yield BaseBackwardsInvocationResponse(data=chunk).model_dump_json().encode() + b"\n\n"
-
                     elif isinstance(chunk, str):
                         yield f"event: {chunk}\n\n".encode()
-                    else:
-                        yield json.dumps(chunk).encode() + b"\n\n"
             except Exception as e:
                 error_message = BaseBackwardsInvocationResponse(error=str(e)).model_dump_json()
                 yield f"{error_message}\n\n".encode()
@@ -28,7 +25,7 @@ class BaseBackwardsInvocation:
                 yield json.dumps(response).encode() + b"\n\n"
 
 
-T = TypeVar("T", bound=BaseModel | dict | str | bool | int)
+T = TypeVar("T", bound=dict | str | bool | int | BaseModel)
 
 
 class BaseBackwardsInvocationResponse(BaseModel, Generic[T]):