diff --git a/app/src/com/cege/games/release/MainActivity.java b/app/src/com/cege/games/release/MainActivity.java
index 27cbc2f..7832d2c 100644
--- a/app/src/com/cege/games/release/MainActivity.java
+++ b/app/src/com/cege/games/release/MainActivity.java
@@ -287,10 +287,14 @@ public class MainActivity extends UnityPlayerActivity
   }
 
   public void signOutGoogle(String funId) {
-    mGoogleSignInClient.signOut()
-        .addOnCompleteListener(this, task -> {
-          // ...
-        });
+    if (isGooglePlayServicesAvailable()) {
+      if (mGoogleSignInClient != null) {
+        mGoogleSignInClient.signOut()
+            .addOnCompleteListener(this, task -> {
+              // ...
+            });
+      }
+    }
   }
 
   private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {