java.lang.NullPointerException: key must not be null
com.revenuecat.purchases.common.caching.DeviceCache.cleanupOldAttributionData(DeviceCache.kt:165)
com.revenuecat.purchases.identity.IdentityManager.configure(IdentityManager.kt:41)
com.revenuecat.purchases.Purchases.(Purchases.kt:160)
com.revenuecat.purchases.Purchases.(Purchases.kt:94)
com.revenuecat.purchases.PurchasesFactory.createPurchases(PurchasesFactory.kt:88)
com.revenuecat.purchases.Purchases$Companion.configure(Purchases.kt:2065)
com.revenuecat.purchases.Purchases.configure(Purchases.kt:2)

A simple null check should fix this issue, i.e.:

@Synchronized
fun cleanupOldAttributionData() {
    val editor = preferences.edit()
    for (key in preferences.all.keys) {
        if (key != null && key.startsWith(attributionCacheKey)) {
            editor.remove(key)
        }
    }
    editor.apply()
}

Can you please add this to the next release?
I have paying users who cannot open the app anymore because the app crash on startup due to this issue.