diff --git a/core/java/android/content/res/Configuration.java b/core/java/android/content/res/Configuration.java
index 861ae7b..9cf54f4 100644
--- a/core/java/android/content/res/Configuration.java
+++ b/core/java/android/content/res/Configuration.java
@@ -1222,7 +1222,15 @@
                                                         .setVariant(variant)
                                                         .setScript(script)
                                                         .build();
-                                list.add(locale);
+                                // Log a WTF here if a repeated locale is found to avoid throwing an
+                                // exception in system server when LocaleList is created below
+                                final int inListIndex = list.indexOf(locale);
+                                if (inListIndex != -1) {
+                                    Slog.wtf(TAG, "Repeated locale (" + list.get(inListIndex) + ")"
+                                            + " found when trying to add: " + locale.toString());
+                                } else {
+                                    list.add(locale);
+                                }
                             } catch (IllformedLocaleException e) {
                                 Slog.e(TAG, "readFromProto error building locale with: "
                                         + "language-" + language + ";country-" + country