Fix crashes

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -295,13 +295,13 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		get() = prefs.getBoolean(KEY_READER_SCREEN_ON, true)
 
 	var readerColorFilter: ReaderColorFilter?
-		get() {
+		get() = runCatching {
 			val brightness = prefs.getFloat(KEY_CF_BRIGHTNESS, ReaderColorFilter.EMPTY.brightness)
 			val contrast = prefs.getFloat(KEY_CF_CONTRAST, ReaderColorFilter.EMPTY.contrast)
 			val inverted = prefs.getBoolean(KEY_CF_INVERTED, ReaderColorFilter.EMPTY.isInverted)
 			val grayscale = prefs.getBoolean(KEY_CF_GRAYSCALE, ReaderColorFilter.EMPTY.isGrayscale)
-			return ReaderColorFilter(brightness, contrast, inverted, grayscale).takeUnless { it.isEmpty }
-		}
+			ReaderColorFilter(brightness, contrast, inverted, grayscale).takeUnless { it.isEmpty }
+		}.getOrNull()
 		set(value) {
 			prefs.edit {
 				val cf = value ?: ReaderColorFilter.EMPTY

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BasePreferenceFragment.kt

@@ -1,5 +1,7 @@
 package org.koitharu.kotatsu.core.ui
 
+import android.content.ActivityNotFoundException
+import android.content.Intent
 import android.os.Bundle
 import android.view.View
 import androidx.annotation.CallSuper
@@ -8,7 +10,9 @@ import androidx.core.graphics.Insets
 import androidx.core.view.updatePadding
 import androidx.preference.PreferenceFragmentCompat
 import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
+import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.util.RecyclerViewOwner
 import org.koitharu.kotatsu.core.ui.util.WindowInsetsDelegate
@@ -62,4 +66,12 @@ abstract class BasePreferenceFragment(@StringRes private val titleId: Int) :
 	protected fun setTitle(title: CharSequence?) {
 		(activity as? SettingsActivity)?.setSectionTitle(title)
 	}
+
+	protected fun startActivitySafe(intent: Intent) {
+		try {
+			startActivity(intent)
+		} catch (_: ActivityNotFoundException) {
+			Snackbar.make(listView, R.string.operation_not_supported, Snackbar.LENGTH_SHORT).show()
+		}
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/ServicesSettingsFragment.kt

@@ -110,11 +110,7 @@ class ServicesSettingsFragment : BasePreferenceFragment(R.string.services),
 				if (account == null) {
 					am.addAccount(accountType, accountType, null, null, requireActivity(), null, null)
 				} else {
-					try {
-						startActivity(SyncSettingsIntent(account))
-					} catch (_: ActivityNotFoundException) {
-						Snackbar.make(listView, R.string.operation_not_supported, Snackbar.LENGTH_SHORT).show()
-					}
+					startActivitySafe(SyncSettingsIntent(account))
 				}
 				true
 			}

app/src/main/kotlin/org/koitharu/kotatsu/settings/about/AboutSettingsFragment.kt

@@ -83,7 +83,7 @@ class AboutSettingsFragment : BasePreferenceFragment(R.string.about) {
 	private fun openLink(url: String, title: CharSequence?) {
 		val intent = Intent(Intent.ACTION_VIEW)
 		intent.data = url.toUri()
-		startActivity(
+		startActivitySafe(
 			if (title != null) {
 				Intent.createChooser(intent, title)
 			} else {

app/src/main/kotlin/org/koitharu/kotatsu/settings/tracker/TrackerSettingsFragment.kt

@@ -84,14 +84,14 @@ class TrackerSettingsFragment :
 				Build.VERSION.SDK_INT >= Build.VERSION_CODES.O -> {
 					val intent = Intent(Settings.ACTION_APP_NOTIFICATION_SETTINGS)
 						.putExtra(Settings.EXTRA_APP_PACKAGE, requireContext().packageName)
-					startActivity(intent)
+					startActivitySafe(intent)
 					true
 				}
 
 				channels.areNotificationsDisabled -> {
 					val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
 						.setData(Uri.fromParts("package", requireContext().packageName, null))
-					startActivity(intent)
+					startActivitySafe(intent)
 					true
 				}