PDFCreator 4.4.2 - System.ApplicationException

Hello PDF Support,

We are using a custom vbscript to convert several files from a root folder.
The custom script reads all child folders from the root folder and converts every file in a child folder to pdf stamping a text and put in folder with name /root/child/converted.
After that, the script makes a new merge with all files converted from the child folder to a new file with the name child.pdf.

Finally the script, merge all child.pfds files to create a new finaly merge pdf with all the files in it.
We are testing the script with 10 and 12 pages and sometimes we face the following issue related to System.ApplicationException,

We don't understand why this issue appear.

Please check the error log and the script file to convert attached.
PDFCreatorScript.txt (9.2 KB)

Hope you can help us to find the root cause,

Best Regards,
Marcos.

Error Report for PDFCreator

Exception:
System.ApplicationException
El método de sincronización del objeto se ha llamado desde un bloque de códigos sin sincronizar.
void ThreadHelper.ThreadStart() :
void LocalMutex.MutexThread() :
void Mutex.ReleaseMutex() :

Platform:

x64
Additional Data:
product.edition=pdfcreator_free
product.name=PDFCreator Free
ui.language=es
Log:
Starting PDFCreator
Command Line parameters:
/PrintFile=C:\TEST\000095153261.pdf
Launched DragAndDropStart
Temp folder is 'C:\Users\marco\AppData\Local\Temp\PDFCreator\Temp'
Spool folder is 'C:\Users\marco\AppData\Local\Temp\PDFCreator\Spool'
LocalAppData folder is 'C:\Users\marco\AppData\Local\pdfforge\PDFCreator'
RoamingAppData folder is 'C:\Users\marco\AppData\Roaming\pdfforge\PDFCreator'
CsScriptLoaderInitialized with following SearchDirs: %CSSCRIPT_DIR%\lib;%CSSCRIPT_INC%;;C:\Program Files\PDFCreator;C:\ProgramData\pdfforge\PDFCreator\CS-Scripts
Trying to resolve assembly: Dropbox.resources, Version=4.4.2.1, Culture=es-ES, PublicKeyToken=fc6825f92a0342e2
The resource assembly will be skipped: Dropbox.resources
Trying to resolve assembly: Dropbox.resources, Version=4.4.2.1, Culture=es-ES, PublicKeyToken=fc6825f92a0342e2
The resource assembly will be skipped: Dropbox.resources
Trying to resolve assembly: Dropbox.resources, Version=4.4.2.1, Culture=es, PublicKeyToken=fc6825f92a0342e2
The resource assembly will be skipped: Dropbox.resources
Trying to resolve assembly: Dropbox.resources, Version=4.4.2.1, Culture=es, PublicKeyToken=fc6825f92a0342e2
The resource assembly will be skipped: Dropbox.resources
Profiles:

High Compression (small file)
High Quality (large file)
JPEG (graphic file)
PDF/A (long term preservation)
PNG (graphic file)
Print after saving
Secured PDF
TIFF (multipage graphic file)
Checking installation...
Checking SpoolerRunningCondition
Checking CheckSpoolFolderCondition
Checking GhostscriptCondition
Checking PrinterInstalledCondition
Checking TerminalServerNotAllowedCondition
Profiles:

Alta compresión (archivo más pequeño)
Alta calidad (archivo más grande)
JPEG (archivo de imagen)
PDF/A (para conservación a largo plazo)
PNG (archivo de imágen)
Imprimir después de guardar
PDF asegurado
TIFF (archivo gráfico de varias páginas)
Starting attempt 1:
Found another running instance of PDFCreator, so we send our data there
Pipe message successfully sent
TrySendPipeMessage: True
Starting update check thread
Starting Cleanup thread
Starting CleanUpThread thread
Adding thread CleanUpThread
Update period did not pass. Next Update is set to: 12/7/2022 15:23:00
Waiting for all threads to finish
Waiting for all synchronized threads to end
1 Threads remaining
Saving settings
Profiles:

Alta compresión (archivo más pequeño)
Alta calidad (archivo más grande)
JPEG (archivo de imagen)
PDF/A (para conservación a largo plazo)
PNG (archivo de imágen)
Imprimir después de guardar
PDF asegurado
TIFF (archivo gráfico de varias páginas)
Starting to watch the registry for changes during standby
Uncaught exception, IsTerminating: True
Stopping to watch the registry for changes during standby
All synchronized threads have ended
Preparing PipeServer for ShutDown
Shutting down the application
Exiting...