diff --git a/service/java/com/android/server/wifi/SoftApManager.java b/service/java/com/android/server/wifi/SoftApManager.java
index aa9c7a9..0f0299f 100644
--- a/service/java/com/android/server/wifi/SoftApManager.java
+++ b/service/java/com/android/server/wifi/SoftApManager.java
@@ -230,15 +230,8 @@
         }
     };
 
-    private final CoexListener mCoexListener = new CoexListener() {
-        @Override
-        public void onCoexUnsafeChannelsChanged() {
-            if (mCurrentSoftApConfiguration == null) {
-                return;
-            }
-            mStateMachine.sendMessage(SoftApStateMachine.CMD_SAFE_CHANNEL_FREQUENCY_CHANGED);
-        }
-    };
+    // This will only be null if SdkLevel is not at least S
+    @Nullable private final CoexListener mCoexListener;
 
     private void updateSafeChannelFrequencyList() {
         if (!SdkLevel.isAtLeastS() || mCurrentSoftApConfiguration == null) {
@@ -323,6 +316,20 @@
         mSoftApNotifier = softApNotifier;
         mWifiNative = wifiNative;
         mCoexManager = coexManager;
+        if (SdkLevel.isAtLeastS()) {
+            mCoexListener = new CoexListener() {
+                @Override
+                public void onCoexUnsafeChannelsChanged() {
+                    if (mCurrentSoftApConfiguration == null) {
+                        return;
+                    }
+                    mStateMachine.sendMessage(
+                            SoftApStateMachine.CMD_SAFE_CHANNEL_FREQUENCY_CHANGED);
+                }
+            };
+        } else {
+            mCoexListener = null;
+        }
         mCountryCode = countryCode;
         mModeListener = listener;
         mSoftApCallback = callback;
diff --git a/service/java/com/android/server/wifi/WifiShellCommand.java b/service/java/com/android/server/wifi/WifiShellCommand.java
index a86cd8f..0231764 100644
--- a/service/java/com/android/server/wifi/WifiShellCommand.java
+++ b/service/java/com/android/server/wifi/WifiShellCommand.java
@@ -55,6 +55,7 @@
 import android.net.wifi.WifiScanner;
 import android.net.wifi.WifiSsid;
 import android.os.Binder;
+import android.os.Build;
 import android.os.Process;
 import android.os.RemoteException;
 import android.os.SystemClock;
@@ -66,6 +67,7 @@
 import android.util.Pair;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.modules.utils.BasicShellCommandHandler;
@@ -1270,6 +1272,7 @@
                 .build();
     }
 
+    @RequiresApi(Build.VERSION_CODES.S)
     @NonNull
     private List<CoexUtils.CoexCellChannel> buildCoexCellChannels() {
         List<CoexUtils.CoexCellChannel> cellChannels = new ArrayList<>();