diff --git a/.github/ISSUE_TEMPLATE/question.yaml b/.github/ISSUE_TEMPLATE/question.yaml
deleted file mode 100644
index 3c79454..0000000
--- a/.github/ISSUE_TEMPLATE/question.yaml
+++ /dev/null
@@ -1,10 +0,0 @@
-name: Question
-description: Write a question
-labels:
-  - question
-
-body:
-  - type: textarea
-    attributes:
-      label: Question
-      description: Please do not write bug reports or feature requests here.
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..ffa7ba6
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,22 @@
+name: Empirical Implementation of JDD
+
+on:
+  pull_request:
+    types:
+      - opened
+
+jobs:
+  lint:
+    permissions:
+      pull-requests: write
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: peter-evans/create-or-update-comment@v4
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            ![Imgur](https://i.imgur.com/ESow3BL.png)
+
+            LGTM
+          reactions: hooray
diff --git a/.github/workflows/notlint.yml b/.github/workflows/notlint.yml
deleted file mode 100644
index faa3343..0000000
--- a/.github/workflows/notlint.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-name: Not Lint
-
-on:
-  pull_request:
-    types:
-      - opened
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: wow-actions/auto-comment@v1
-        with:
-          GITHUB_TOKEN: ${{ github.token }}
-          pullRequestOpened: |
-            ![Imgur](https://i.imgur.com/ESow3BL.png)
-
-            LGTM
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c3b0f8d..20cd974 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,6 +10,7 @@ repos:
       - id: check-merge-conflict
       - id: check-case-conflict
       - id: check-ast
+      - id: check-yaml
       - id: trailing-whitespace
         args: [--markdown-linebreak-ext=md]
       - id: end-of-file-fixer
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70572b9..8481da1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 2024-04-17
+
+- v24.4.2
+- `params.txt` 파일이 없을 때 에러가 발생하지 않도록 수정
+- 파이썬 3.9 이하에서 유니온 타입 에러 방지
+
 ## 2024-04-14
 
 - v24.4.1
diff --git a/aaaaaa/helper.py b/aaaaaa/helper.py
index 2bcda32..27dd6a9 100644
--- a/aaaaaa/helper.py
+++ b/aaaaaa/helper.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from contextlib import contextmanager
 from copy import copy
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING, Any, Union
 
 import torch
 
@@ -21,7 +21,7 @@ else:
         StableDiffusionProcessingTxt2Img,
     )
 
-PT = StableDiffusionProcessingTxt2Img | StableDiffusionProcessingImg2Img
+PT = Union[StableDiffusionProcessingTxt2Img, StableDiffusionProcessingImg2Img]
 
 
 @contextmanager
diff --git a/adetailer/__version__.py b/adetailer/__version__.py
index de57016..5068bd4 100644
--- a/adetailer/__version__.py
+++ b/adetailer/__version__.py
@@ -1 +1 @@
-__version__ = "24.4.1"
+__version__ = "24.4.2"
diff --git a/scripts/!adetailer.py b/scripts/!adetailer.py
index 0ec861d..b3fb1c6 100644
--- a/scripts/!adetailer.py
+++ b/scripts/!adetailer.py
@@ -4,7 +4,6 @@ import platform
 import re
 import sys
 import traceback
-from contextlib import suppress
 from copy import copy
 from functools import partial
 from pathlib import Path
@@ -71,6 +70,8 @@ from modules.shared import cmd_opts, opts, state
 if TYPE_CHECKING:
     from fastapi import FastAPI
 
+PARAMS_TXT = "params.txt"
+
 no_huggingface = getattr(cmd_opts, "ad_no_huggingface", False)
 adetailer_dir = Path(paths.models_path, "adetailer")
 safe_mkdir(adetailer_dir)
@@ -409,9 +410,15 @@ class AfterDetailerScript(scripts.Script):
             p, p.all_prompts, p.all_seeds, p.all_subseeds, None, 0, 0
         )
 
+    def read_params_txt(self) -> str:
+        params_txt = Path(paths.data_path, PARAMS_TXT)
+        if params_txt.exists():
+            return params_txt.read_text(encoding="utf-8")
+        return ""
+
     def write_params_txt(self, content: str) -> None:
-        params_txt = Path(paths.data_path, "params.txt")
-        with suppress(Exception):
+        params_txt = Path(paths.data_path, PARAMS_TXT)
+        if params_txt.exists() and content:
             params_txt.write_text(content, encoding="utf-8")
 
     @staticmethod
@@ -783,7 +790,7 @@ class AfterDetailerScript(scripts.Script):
         pp.image = ensure_pil_image(pp.image, "RGB")
         init_image = copy(pp.image)
         arg_list = self.get_args(p, *args_)
-        params_txt_content = Path(paths.data_path, "params.txt").read_text("utf-8")
+        params_txt_content = self.read_params_txt()
 
         if need_call_postprocess(p):
             dummy = Processed(p, [], p.seed, "")