diff --git a/camera/provider/2.4/default/ExternalCameraProviderImpl_2_4.cpp b/camera/provider/2.4/default/ExternalCameraProviderImpl_2_4.cpp
index 04db7f3..2d919cc 100644
--- a/camera/provider/2.4/default/ExternalCameraProviderImpl_2_4.cpp
+++ b/camera/provider/2.4/default/ExternalCameraProviderImpl_2_4.cpp
@@ -95,13 +95,14 @@
 
 Return<Status> ExternalCameraProviderImpl_2_4::setCallback(
         const sp<ICameraProviderCallback>& callback) {
+    if (callback == nullptr) {
+        return Status::ILLEGAL_ARGUMENT;
+    }
+
     {
         Mutex::Autolock _l(mLock);
         mCallbacks = callback;
     }
-    if (mCallbacks == nullptr) {
-        return Status::OK;
-    }
     // Send a callback for all devices to initialize
     {
         for (const auto& pair : mCameraStatusMap) {
diff --git a/camera/provider/2.4/default/LegacyCameraProviderImpl_2_4.cpp b/camera/provider/2.4/default/LegacyCameraProviderImpl_2_4.cpp
index 69318c7..07ed689 100644
--- a/camera/provider/2.4/default/LegacyCameraProviderImpl_2_4.cpp
+++ b/camera/provider/2.4/default/LegacyCameraProviderImpl_2_4.cpp
@@ -448,11 +448,11 @@
 // Methods from ::android::hardware::camera::provider::V2_4::ICameraProvider follow.
 Return<Status> LegacyCameraProviderImpl_2_4::setCallback(
         const sp<ICameraProviderCallback>& callback) {
+    if (callback == nullptr) {
+        return Status::ILLEGAL_ARGUMENT;
+    }
     Mutex::Autolock _l(mCbLock);
     mCallbacks = callback;
-    if (mCallbacks == nullptr) {
-        return Status::OK;
-    }
     // Add and report all presenting external cameras.
     for (auto const& statusPair : mCameraStatusMap) {
         int id = std::stoi(statusPair.first);
diff --git a/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.cpp b/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.cpp
index 62ce074..eba49a5 100644
--- a/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.cpp
+++ b/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.cpp
@@ -91,11 +91,11 @@
 
 Return<Status> ExternalCameraProviderImpl_2_7::setCallback(
         const sp<ICameraProviderCallback>& callback) {
+    if (callback == nullptr) {
+        return Status::ILLEGAL_ARGUMENT;
+    }
     Mutex::Autolock _l(mLock);
     mCallbacks = callback;
-    if (mCallbacks == nullptr) {
-        return Status::OK;
-    }
     // Send a callback for all devices to initialize
     {
         for (const auto& pair : mCameraStatusMap) {
diff --git a/camera/provider/default/ExternalCameraProvider.cpp b/camera/provider/default/ExternalCameraProvider.cpp
index 4d2c847..54875ab 100644
--- a/camera/provider/default/ExternalCameraProvider.cpp
+++ b/camera/provider/default/ExternalCameraProvider.cpp
@@ -75,15 +75,15 @@
 
 ndk::ScopedAStatus ExternalCameraProvider::setCallback(
         const std::shared_ptr<ICameraProviderCallback>& in_callback) {
+    if (in_callback == nullptr) {
+        return fromStatus(Status::ILLEGAL_ARGUMENT);
+    }
+
     {
         Mutex::Autolock _l(mLock);
         mCallback = in_callback;
     }
 
-    if (mCallback == nullptr) {
-        return fromStatus(Status::OK);
-    }
-
     for (const auto& pair : mCameraStatusMap) {
         mCallback->cameraDeviceStatusChange(pair.first, pair.second);
     }