PHP PDO - The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION - sql-server

Question

While inserting into MSSQL using PHP PDO Dblib I am having this error
exit signal Segmentation fault in apache error log
When I checked the free tds log the error is
The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION
However this is happening for a particular case only that is when I have string for a float data type. Below is my code:
$conn = new PDO('dblib:host=hostname;dbname=mydbname', 'user', 'password');
$conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$conn->beginTransaction();
$query = 'INSERT INTO [TestTable] ([RecordNo], [Paymode], [VATVALUE])
VALUES (:RecordNo, :Paymode, :VATVALUE)';
$stmt = $conn->prepare($query);
try {
$stmt->execute( [":VATVALUE" => "158.4'", ":Paymode" => "CREDIT",
":RecordNo" => "ABC-312735"] );
$conn->commit();
} catch(PDOException $e) {
$conn->rollback();
}
Please note the vat value which I have set it as
158.4'
for replicating the error. However when I remove the transaction statements then it is throwing the proper error i.e.
Error converting data type varchar to float
Interestingly the beginTransaction() is working perfectly if I specify a wrong column name in the statement. The transaction is not working only for this conversion error and throwing signal segmentation fault error.
I am using PHP 7.0 in ubuntu 16.04. Wondering why rollback working fine in all cases like wrong column names or table name but not in the conversion case.

Answer 1

There are errors in SQL Server which will automatically roll back your transaction, and it's an error to attempt a rollback after that. Instead of
$conn->rollback();
try executing the batch
if ##trancount>0 rollback;
I don't know PHP but perhaps something like:
$conn->prepare("if ##trancount>0 rollback;")->execute();