The two are probably unrelated, but I can't tell you anything without at least a KOReader crash.log (it's in the koreader folder), and ideally a system log dump as well (was is ;dm in the search bar? Can't remember).
Sidebar: KOReader has its own native screensaver handling (provided you're not using an SO device). And if you were using an SO device, you wouldn't be able to use the SS hack anyway, and neither would KOReader let you use its native SS, so I'm going to assume that's not your case.
So that's not even the right way to achieve what you want, just setup KOReader to your liking (Gear > Screen > Screensaver, IIRC).
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