diff --git a/core/java/com/android/internal/os/PowerProfile.java b/core/java/com/android/internal/os/PowerProfile.java
index d3fe582ab4bd6..9d0cb0115ee40 100644
--- a/core/java/com/android/internal/os/PowerProfile.java
+++ b/core/java/com/android/internal/os/PowerProfile.java
@@ -393,6 +393,9 @@ public class PowerProfile {
     }
 
     public int getNumCoresInCpuCluster(int cluster) {
+        if (cluster < 0 || cluster >= mCpuClusters.length) {
+            return 0; // index out of bound
+        }
         return mCpuClusters[cluster].numCpus;
     }