MATHDR32: Undefined variable in formula causes driver stop during Runtime Start

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• Combi Element with formula: Deleted Operand Variable -> Runtime crash

  Summary Formula with illegal variable index in combi element can cause runtime crash Description Formula with illegal variable index in combi element can cause runtime crash Issue Number: 234032 Fixed on Date: 22.12.2020 Versions: 8.20 0 BUILD 79336

• Checklist: Communication to TwinCat via BeckhoffNG driver

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• FAQ: What can I do if the Service Engine does not start or is closed with an unhandled exception and the error message "(InitInstance (); an unnamed file has a bad format)" or "Init Instance (): an attempt was made to access an unnamed file past its end" is shown?

  This issue may occur due to missing digital certificates on the system where the error appears. Microsoft Windows implements a mechanism that automatically downloads, over the internet, trusted root certificate authorities, which are not installed ...