Looks like a color coding issue. Bad embedded language index (probably for PHP)
However, this crash dump seems to be for 29.0.3 and not 29.0.4.
Looks like you ran SlickEdit from c:\Program Files\SlickEditLatest\win\vs.exe.
We've added additional embedded language index error checking in 29.0.4
Remove all your crash dumps and make sure you are running 29.0.4.
Check Help>About SlickEdit to verify version.
Post again if you get another crash with 29.0.4