A hotfix of WebUI.NET Framework 3.0 has been available to fix the reported error which persist on our live sample of WebCombo. You can download this hotfix in here (WebUINET3_0_5000_976.zip).

The hotfix resolves the reported problem. I have applied the hotfix on the local sample of WebCombo (WebUI Unified C# Samples) and the problem is no longer persist.

Please find two screenshots in the attachment:

• ConsoleShowsNoError.png
  shows that no JS exception persist when render WebCombo 7 on Safari 10.
• WebUIFrameworkVersion.png
  please take a look at the bottom left corner which shows that hotfix of WebUI.NET Framework 3.0.5000.976 has been applied (indicated by the number "305000976" shown in the screenshot).

We'll have the hotfix applied to the live sample as soon as possible and thank you for letting us know.