diff --git a/src/com/android/settings/wifi/tether/WifiTetherBasePreferenceController.java b/src/com/android/settings/wifi/tether/WifiTetherBasePreferenceController.java
index a950dc312cd..1a78d37b137 100644
--- a/src/com/android/settings/wifi/tether/WifiTetherBasePreferenceController.java
+++ b/src/com/android/settings/wifi/tether/WifiTetherBasePreferenceController.java
@@ -47,7 +47,7 @@ public abstract class WifiTetherBasePreferenceController extends AbstractPrefere
         mListener = listener;
         mWifiManager = context.getSystemService(WifiManager.class);
         mTm = context.getSystemService(TetheringManager.class);
-        mWifiRegexs = mTm.getTetherableWifiRegexs();
+        mWifiRegexs = mTm != null ? mTm.getTetherableWifiRegexs() : null;
     }
 
     @Override