fix #4294: do not migrate nonexistent settings

1 files changed, 6 insertions, 0 deletions

diff --git a/main/src/cgeo/geocaching/settings/Settings.java b/main/src/cgeo/geocaching/settings/Settings.java
index d45ded2..4f2721f 100644
--- a/main/src/cgeo/geocaching/settings/Settings.java
+++ b/main/src/cgeo/geocaching/settings/Settings.java
@@ -113,6 +113,12 @@ public class Settings {
         if (oldVersion < 1) {
             final String oldPreferencesName = "cgeo.pref";
             final SharedPreferences old = CgeoApplication.getInstance().getSharedPreferences(oldPreferencesName, Context.MODE_PRIVATE);
+
+            // No need to migrate if the shared preferences did not previously exist, the defaults will be fine.
+            if (old.getAll().isEmpty()) {
+                return;
+            }
+
             final Editor e = sharedPrefs.edit();
 
             e.putString(getKey(R.string.pref_temp_twitter_token_secret), old.getString(getKey(R.string.pref_temp_twitter_token_secret), null));