diff --git a/core/java/android/hardware/camera2/CaptureRequest.java b/core/java/android/hardware/camera2/CaptureRequest.java
index 5df64e3cca9ec..d94ad3aa17324 100644
--- a/core/java/android/hardware/camera2/CaptureRequest.java
+++ b/core/java/android/hardware/camera2/CaptureRequest.java
@@ -623,6 +623,11 @@ public final class CaptureRequest extends CameraMetadata<CaptureRequest.Key<?>>
 
     @Override
     public void writeToParcel(Parcel dest, int flags) {
+        if (!mPhysicalCameraSettings.containsKey(mLogicalCameraId)) {
+            throw new IllegalStateException("Physical camera settings map must contain a key for "
+                    + "the logical camera id.");
+        }
+
         int physicalCameraCount = mPhysicalCameraSettings.size();
         dest.writeInt(physicalCameraCount);
         //Logical camera id and settings always come first.