diff --git a/services/companion/java/com/android/server/companion/CompanionApplicationController.java b/services/companion/java/com/android/server/companion/CompanionApplicationController.java
index be1bc7907cd55..c39b59ae35b3b 100644
--- a/services/companion/java/com/android/server/companion/CompanionApplicationController.java
+++ b/services/companion/java/com/android/server/companion/CompanionApplicationController.java
@@ -26,6 +26,7 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.os.Handler;
 import android.util.Log;
+import android.util.Slog;
 import android.util.SparseArray;
 
 import com.android.internal.annotations.GuardedBy;
@@ -120,6 +121,12 @@ class CompanionApplicationController {
             mBoundCompanionApplications.setValueForPackage(userId, packageName, serviceConnectors);
         }
 
+        if (serviceConnectors.isEmpty()) {
+            Slog.e(TAG, "Can't find CompanionDeviceService implementer in package: "
+                    + packageName + ". Please check if they are correctly declared.");
+            return;
+        }
+
         // The first connector in the list is always the primary connector: set a listener to it.
         serviceConnectors.get(0).setListener(this::onPrimaryServiceBindingDied);