diff --git a/services/core/java/com/android/server/location/gnss/GnssConfiguration.java b/services/core/java/com/android/server/location/gnss/GnssConfiguration.java
index 5ef89ad..ff16972 100644
--- a/services/core/java/com/android/server/location/gnss/GnssConfiguration.java
+++ b/services/core/java/com/android/server/location/gnss/GnssConfiguration.java
@@ -379,7 +379,7 @@
             configs = CarrierConfigManager.getDefaultConfig();
         }
         for (String configKey : configs.keySet()) {
-            if (configKey.startsWith(CarrierConfigManager.Gps.KEY_PREFIX)) {
+            if (configKey != null && configKey.startsWith(CarrierConfigManager.Gps.KEY_PREFIX)) {
                 String key = configKey
                         .substring(CarrierConfigManager.Gps.KEY_PREFIX.length())
                         .toUpperCase();