Данные не вставляются PDO

Я пытаюсь создать форму автосохранения в PHP через PDO вначале все работало нормально, но после завершения не работает.
П.С .: Я создал свой сценарий с помощью этого POST: {Нажмите, чтобы увидеть}


HTML

<form method="POST" action="ePHP/addNewStory.php">
<input type="text" name="storyDate" value="<?php echo date("j-n-Y"); ?>" placeholder="<?php echo date("j-n-Y"); ?>"/>
<input type="file" name="storyImage" id="input-file-now image"  class="dropify" accept='image/*'/>
<input type="text" name="storyImageTitle"/>
<input type="checkbox" name="storyComments" checked class="js-switch col-lg-6" data-color="#86c34a"  />
<button type="submit" class="btn btn-success">Publish</button>
<button type="reset" class="btn btn-inverse model_img" id="sa-warning">Cancel</button>
<input type="text" name="storyPublisher" hidden value="1">
<input type="text" name="storyTitle" >
<input type="text" name="storyExcerpt">
<textarea name="editor1" class="Detail"></textarea>
<input type="text" name="storyAuthor"/>
<select  name="storyCategory[]" class="select2 select2-multiple" multiple="multiple">
<optgroup label="Home">
<option value="AK">Alaska</option>
<option value="HI">Hawaii</option>
</optgroup>
<optgroup label="Pacific Time Zone">
<option value="CA">California</option>
<option value="NV">Nevada</option>
<option value="OR">Oregon</option>
<option value="WA">Washington</option>
</optgroup>
</select>
</form>

JS

<script>
$(function () {
$.post("ePHP/addNewStory.php", function (data) {
$("[name='storyPublisher']").val(data.storyPublisher);
$("[name='storyTitle']").val(data.storyTitle);
$("[name='storyExcerpt']").val(data.storyExcerpt);
$("[name='editor1']").val(data.editor1);
$("[name='storyCategory[]']").val(data.storyCategory);
$("[name='storyDate']").val(data.storyDate);
$("[name='storyImageTitle']").val(data.storyImageTitle);
}, "json");
setInterval(function () {
$.post("ePHP/addNewStory.php", $("form").serialize());
}, 2000);
});
</script>

PHP (AddNewStory.php)

<?php
session_start();
try {
$dc = new PDO("mysql:host=localhost;dbname=UPmain", 'root', 'root');
$dc->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$storyTitle=$_POST['storyTitle'];
$storyExcerpt=$_POST['storyExcerpt'];
$editor1=$_POST['editor1'];
$storyCategory=$_POST['storyCategory'];
$storyDate=$_POST['storyDate'];
$storyImageTitle=$_POST['storyImageTitle'];
$storyCategory=implode(',', $storyCategory);
$storyPublisher=1;$stmt = $dc->query("SELECT * FROM storyAutoSave WHERE storyPublisher='$storyPublisher'");
$return_count = $stmt->rowCount();
if($return_count > 0){

if(isset($storyTitle)){
$update_qry = $dc->prepare("UPDATE storyAutoSave SET storyTitle=:storyTitle, storyExcerpt=:storyExcerpt, storyDetail=:editor1, storyCategory=:storyCategory, storyDate=:storyDate, storyImageTitle=:storyImageTitle WHERE storyPublisher='$storyPublisher'");
$update_qry -> bindValue(':storyTitle', $storyTitle, PDO::PARAM_STR);
$update_qry -> bindValue(':storyExcerpt', $storyExcerpt, PDO::PARAM_STR);
$update_qry -> bindValue(':editor1', $editor1, PDO::PARAM_STR);
$update_qry -> bindValue(':storyCategory', $storyCategory, PDO::PARAM_STR);
$update_qry -> bindValue(':storyDate', $storyDate, PDO::PARAM_STR);
$update_qry -> bindValue(':storyImageTitle', $storyImageTitle, PDO::PARAM_STR);
$update_qry -> execute();
} else {
$get_autosave = $dc->prepare("SELECT * FROM storyAutoSave WHERE storyPublisher='$storyPublisher'");
$get_autosave->execute();
while ($gt_v = $get_autosave->fetch(PDO::FETCH_ASSOC)) {
$storyTitle=$gt_v['storyTitle'];
$storyExcerpt=$gt_v['storyExcerpt'];
$storyDetail=$gt_v['storyDetail'];
$storyCategory=$gt_v['storyCategory'];
$storyDate=$gt_v['storyDate'];
$storyImageTitle=$gt_v['storyImageTitle'];
echo json_encode(array('storyTitle' => $storyTitle, 'storyExcerpt' => $storyExcerpt, 'editor1' => $storyDetail, 'storyCategory' => $storyCategory, 'storyDate' => $storyDate, 'storyImageTitle' => $storyImageTitle));
}
}
} else {
$insert_qry = $dc->prepare("INSERT INTO storyAutoSave (storyPublisher, storyTitle, storyExcerpt, storyDetail, storyCategory, storyDate, storyImageTitle) VALUES (storyPublisher=:storyPublisher, storyTitle=:storyTitle, storyExcerpt=:storyExcerpt, storyDetail=:editor1, storyCategory=:storyCategory, storyDate=:storyDate, storyImageTitle=:storyImageTitle)");
$insert_qry -> bindValue(':storyTitle', $storyTitle, PDO::PARAM_STR);
$insert_qry -> bindValue(':storyExcerpt', $storyExcerpt, PDO::PARAM_STR);
$insert_qry -> bindValue(':editor1', $editor1, PDO::PARAM_STR);
$insert_qry -> bindValue(':storyCategory', $storyCategory, PDO::PARAM_STR);
$insert_qry -> bindValue(':storyDate', $storyDate, PDO::PARAM_STR);
$insert_qry -> bindValue(':storyImageTitle', $storyImageTitle, PDO::PARAM_STR);
$insert_qry -> bindValue(':storyPublisher', $storyPublisher, PDO::PARAM_STR);
$insert_qry->execute();
}
} catch(PDOException $e) {
echo $e->getMessage();
}
?>

Я также попробовал это:

$insert_qry = $dc->prepare("INSERT INTO storyAutoSave (storyPublisher, storyTitle, storyExcerpt, storyDetail, storyCategory, storyDate, storyImageTitle) VALUES (?, ?, ?, ?, ?, ?, ?)");
$insert_qry->bindParam(1, $storyPublisher);
$insert_qry->bindParam(2, $storyTitle, PDO::PARAM_STR);
$insert_qry->bindParam(3, $storyExcerpt, PDO::PARAM_STR);
$insert_qry->bindParam(4, $editor1, PDO::PARAM_STR);
$insert_qry->bindParam(5, $storyCategory, PDO::PARAM_STR);
$insert_qry->bindParam(6, $storyDate, PDO::PARAM_STR);
$insert_qry->bindParam(7, $storyImageTitle, PDO::PARAM_STR);
$insert_qry->execute();

А также addNewStory.php дай мне эту ошибку: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'storyTitle' cannot be null

Когда я вставляю значение в столбец «storyPublisher» в базе данных, все начинает работать