diff --git a/app/src/main/java/org/mozilla/focus/autocomplete/AutocompleteSettingsFragment.kt b/app/src/main/java/org/mozilla/focus/autocomplete/AutocompleteSettingsFragment.kt
index a412d286a77..7bffb850a0d 100644
--- a/app/src/main/java/org/mozilla/focus/autocomplete/AutocompleteSettingsFragment.kt
+++ b/app/src/main/java/org/mozilla/focus/autocomplete/AutocompleteSettingsFragment.kt
@@ -45,13 +45,13 @@ class AutocompleteSettingsFragment : BaseSettingsFragment(), SharedPreferences.O
 
         showToolbar(getString(R.string.preference_subitem_autocomplete))
 
-        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.registerOnSharedPreferenceChangeListener(this)
     }
 
     override fun onPause() {
         super.onPause()
 
-        preferenceManager.sharedPreferences.unregisterOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.unregisterOnSharedPreferenceChangeListener(this)
     }
 
     override fun onPreferenceTreeClick(preference: androidx.preference.Preference?): Boolean {
diff --git a/app/src/main/java/org/mozilla/focus/search/SearchEnginePreference.kt b/app/src/main/java/org/mozilla/focus/search/SearchEnginePreference.kt
index 4eee186462f..8f49543ffdf 100644
--- a/app/src/main/java/org/mozilla/focus/search/SearchEnginePreference.kt
+++ b/app/src/main/java/org/mozilla/focus/search/SearchEnginePreference.kt
@@ -29,12 +29,12 @@ class SearchEnginePreference : Preference, SharedPreferences.OnSharedPreferenceC
 
     override fun onAttached() {
         summary = defaultSearchEngineName
-        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.registerOnSharedPreferenceChangeListener(this)
         super.onAttached()
     }
 
     override fun onPrepareForRemoval() {
-        preferenceManager.sharedPreferences.unregisterOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.unregisterOnSharedPreferenceChangeListener(this)
         super.onPrepareForRemoval()
     }
 
diff --git a/app/src/main/java/org/mozilla/focus/settings/SearchSettingsFragment.kt b/app/src/main/java/org/mozilla/focus/settings/SearchSettingsFragment.kt
index 719405473a0..965dd082d99 100644
--- a/app/src/main/java/org/mozilla/focus/settings/SearchSettingsFragment.kt
+++ b/app/src/main/java/org/mozilla/focus/settings/SearchSettingsFragment.kt
@@ -27,13 +27,13 @@ class SearchSettingsFragment :
     override fun onResume() {
         super.onResume()
 
-        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.registerOnSharedPreferenceChangeListener(this)
 
         showToolbar(getString(R.string.preference_category_search))
     }
 
     override fun onPause() {
-        preferenceManager.sharedPreferences.unregisterOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.unregisterOnSharedPreferenceChangeListener(this)
         super.onPause()
     }
 
diff --git a/app/src/main/java/org/mozilla/focus/settings/advanced/AdvancedSettingsFragment.kt b/app/src/main/java/org/mozilla/focus/settings/advanced/AdvancedSettingsFragment.kt
index 68a857ffeaa..dd310c42f32 100644
--- a/app/src/main/java/org/mozilla/focus/settings/advanced/AdvancedSettingsFragment.kt
+++ b/app/src/main/java/org/mozilla/focus/settings/advanced/AdvancedSettingsFragment.kt
@@ -34,13 +34,13 @@ class AdvancedSettingsFragment :
     override fun onResume() {
         super.onResume()
 
-        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.registerOnSharedPreferenceChangeListener(this)
 
         showToolbar(getString(R.string.preference_category_advanced))
     }
 
     override fun onPause() {
-        preferenceManager.sharedPreferences.unregisterOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.unregisterOnSharedPreferenceChangeListener(this)
         super.onPause()
     }
 
diff --git a/app/src/main/java/org/mozilla/focus/settings/advanced/SecretSettingsFragment.kt b/app/src/main/java/org/mozilla/focus/settings/advanced/SecretSettingsFragment.kt
index cc9730109ae..e9a0c6f654e 100644
--- a/app/src/main/java/org/mozilla/focus/settings/advanced/SecretSettingsFragment.kt
+++ b/app/src/main/java/org/mozilla/focus/settings/advanced/SecretSettingsFragment.kt
@@ -21,7 +21,7 @@ class SecretSettingsFragment :
     override fun onStart() {
         super.onStart()
         showToolbar(getString(R.string.preference_secret_settings))
-        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.registerOnSharedPreferenceChangeListener(this)
     }
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
diff --git a/app/src/main/java/org/mozilla/focus/settings/privacy/PrivacySecuritySettingsFragment.kt b/app/src/main/java/org/mozilla/focus/settings/privacy/PrivacySecuritySettingsFragment.kt
index b2bd490c63c..138e158172a 100644
--- a/app/src/main/java/org/mozilla/focus/settings/privacy/PrivacySecuritySettingsFragment.kt
+++ b/app/src/main/java/org/mozilla/focus/settings/privacy/PrivacySecuritySettingsFragment.kt
@@ -31,7 +31,8 @@ class PrivacySecuritySettingsFragment :
     override fun onCreatePreferences(p0: Bundle?, p1: String?) {
         addPreferencesFromResource(R.xml.privacy_security_settings)
 
-        val biometricPreference: SwitchPreferenceCompat? = findPreference(getString(R.string.pref_key_biometric))
+        val biometricPreference: SwitchPreferenceCompat? =
+            findPreference(getString(R.string.pref_key_biometric))
         val appName = getString(R.string.app_name)
         biometricPreference?.summary =
             getString(R.string.preference_security_biometric_summary2, appName)
@@ -72,14 +73,14 @@ class PrivacySecuritySettingsFragment :
         updateStealthToggleAvailability()
         updateExceptionSettingAvailability()
 
-        preferenceManager.sharedPreferences.registerOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.registerOnSharedPreferenceChangeListener(this)
 
         // Update title and icons when returning to fragments.
         showToolbar(getString(R.string.preference_privacy_and_security_header))
     }
 
     override fun onPause() {
-        preferenceManager.sharedPreferences.unregisterOnSharedPreferenceChangeListener(this)
+        preferenceManager.sharedPreferences?.unregisterOnSharedPreferenceChangeListener(this)
         super.onPause()
     }
 
@@ -113,23 +114,25 @@ class PrivacySecuritySettingsFragment :
     }
 
     private fun updateBiometricsToggleAvailability() {
-        val switch = preferenceScreen.findPreference(resources.getString(R.string.pref_key_biometric))
-            as? SwitchPreferenceCompat
+        val switch =
+            preferenceScreen.findPreference(resources.getString(R.string.pref_key_biometric))
+                as? SwitchPreferenceCompat
 
         if (!requireContext().canUseBiometricFeature()) {
             switch?.isChecked = false
             switch?.isEnabled = false
             preferenceManager.sharedPreferences
-                .edit()
-                .putBoolean(resources.getString(R.string.pref_key_biometric), false)
-                .apply()
+                ?.edit()
+                ?.putBoolean(resources.getString(R.string.pref_key_biometric), false)
+                ?.apply()
         } else {
             switch?.isEnabled = true
         }
     }
 
     private fun updateExceptionSettingAvailability() {
-        val exceptionsPreference: Preference? = findPreference(getString(R.string.pref_key_screen_exceptions))
+        val exceptionsPreference: Preference? =
+            findPreference(getString(R.string.pref_key_screen_exceptions))
         exceptionsPreference?.isEnabled = false
 
         requireComponents.trackingProtectionUseCases.fetchExceptions.invoke { exceptions ->
@@ -199,17 +202,19 @@ class PrivacySecuritySettingsFragment :
     private fun updateStealthToggleAvailability() {
         val switch =
             preferenceScreen.findPreference(resources.getString(R.string.pref_key_secure)) as? SwitchPreferenceCompat
-        if (preferenceManager.sharedPreferences
-            .getBoolean(
-                    resources.getString(R.string.pref_key_biometric),
-                    false,
-                )
+
+        val sharedPreferences = preferenceManager.sharedPreferences
+
+        if (sharedPreferences?.getBoolean(
+                resources.getString(R.string.pref_key_biometric),
+                false,
+            ) == true
         ) {
-            preferenceManager.sharedPreferences
-                .edit().putBoolean(
-                    resources.getString(R.string.pref_key_secure),
-                    true,
-                ).apply()
+            sharedPreferences
+                .edit()
+                .putBoolean(resources.getString(R.string.pref_key_secure), true)
+                .apply()
+
             // Disable the stealth switch
             switch?.isChecked = true
             switch?.isEnabled = false