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Keil µVision5 crashes after opening header-file

Hello,

since 2 or 3 days I noticed crashes of Keil uVision, whenever a *.h-File is being opened.
Problem is, this only occurs when a headerfile marked as 'text file' is being opened in a mbedOS project, exported for uVision5. The file is opened in Keil, displayed for 2-3 seconds, cursor blinking, then Keil freezes, marked text stays marked, cursor stops blinking, then after another 1-2 seconds Keil crashes. No notice whatsoever.

In other projects I can't reproduce this.
What I'd like to know is, if there are possible configuration settings in Keil, which might lead to the behavior of Keil to crash 2-3 seconds after opening a header file. I already checked for recursive header includes and specifically chose a headefile which strictly contains only #define's. Additionally I can observe the exact same crash when opening an empty header file.

I suspect some part of the syntax highlighting or code-completion mechanism to hang on this, since the file is open for 2-3 seconds, cursor blinking, then Keil freezes for 1-2 seconds and is gone.

Keil Version: 5.25.1.0 / 5.25.2.0
Windows 10 1803

Attached are two links to pastebin showing the windows eventlog error notices of the crash with Keil v5.25.1.0 & v5.25.2.0

5.25.1.0 - https://pastebin.com/KZ55wYr1
5.25.2.0 - https://pastebin.com/ze4SAkJi