OPC UA Toolkit 2025 Q3 Crash 0xc0000005 After Click "Close (X)" Button on OPC UA EXE

Issue Details

I am using OPC UA toolkit in my LabVIEW development and it is working well. However, when I created Executable from the LabVIEW development code, then error crash access violation (0xC0000005) at EIP=0x00007FFED4ED7610 after click "close (X)" button on OPC UA EXE when using OPC UA Toolkit 2025 Q3.

License is properly licensed for OPC development and deployment. Any advice why this issue occurs?

Solution

You can safely ignore the error report as this does not mean there is some issues in OPC functionality.

According to NI R&D team, the error dialog box appears after closing the application because the system attempts to free memory that has already been released. This does not impact the functionality of the OPC UA Toolkit, so you can continue using it without concern. 

Currently, there are three workarounds for this issue:

1. Ignore the dialog box – simply close it. You can then continue using LabVIEW or your application (EXE). We have tested on our end and confirmed that everything works as expected. If you notice any issues when relaunching LabVIEW/exe, please let us know.
2. Disable NI Error Reporting – this will prevent the dialog box from appearing: 
   1. Search for "NI Error Reporting Settings" in Windows.
   2. Open the executable.
   3. Turn off/disable Participate in NI Error Reporting.
3. Continue to use 2022 Q4 OPC UA toolkit instead.

NI R&D has acknowledged and identified the issue. A fix is planned and will be included in the next OPC UA Toolkit release (26Q1).