Thanks for your patience.
The issue with " NullReferenceException occurs while merging two PDF documents" has been resolved already in our latest release 188.8.131.52 and the patch for this fix with mentioned version 184.108.40.206 can be downloaded from the following location.
Recommended approach - exe will perform automatic configuration
Please find the patch setup from below location:
Advanced approach – use only if you have specific needs and can directly replace existing assemblies for your build environment
Please find the patch assemblies alone from below location:
Assembly Version: 220.127.116.11
Installation Directions :
This patch should replace the files “Syncfusion.Pdf.Base” under the following folder.
$system drive:\ Files\Syncfusion\Essential Studio\$Version # \precompiledassemblies\$Version#\4.5.1
Eg : $system drive:\Program Files\Syncfusion\Essential Studio\18.104.22.168\precompiledassemblies\22.214.171.124\4.0
To automatically run the Assembly Manager, please check the Run assembly manager checkbox option while installing the patch. If this option is unchecked, the patch will replace the assemblies in precompiled assemblies’ folder only. Then, you will have to manually copy and paste them to the preferred location or you will have to run the Syncfusion Assembly Manager application (available from the Syncfusion Dashboard, installed as a shortcut in the Application menu) to re-install assemblies.
To change how you receive bug fixes, ask your license management portal admin to change your project’s patch delivery mode.
Please note that we have created this patch for version 126.96.36.199 specifically to resolve the following issue(s) reported in this/the incident(s). 145774
if you have received other patches for the same version for other products, please apply all patches in the order received.