diff --git a/cpp/velox/compute/WholeStageResultIterator.cc b/cpp/velox/compute/WholeStageResultIterator.cc
index c1ae6f218458..7deb9b56a062 100644
--- a/cpp/velox/compute/WholeStageResultIterator.cc
+++ b/cpp/velox/compute/WholeStageResultIterator.cc
@@ -192,6 +192,7 @@ std::shared_ptr<velox::core::QueryCtx> WholeStageResultIterator::createNewVeloxQ
 
 std::shared_ptr<ColumnarBatch> WholeStageResultIterator::next() {
   tryAddSplitsToTask();
+  GLUTEN_CHECK(task_ != nullptr, "task_ is nullptr");
   if (task_->isFinished()) {
     return nullptr;
   }
diff --git a/cpp/velox/memory/VeloxMemoryManager.cc b/cpp/velox/memory/VeloxMemoryManager.cc
index 597ce1c9da37..bad535f20d89 100644
--- a/cpp/velox/memory/VeloxMemoryManager.cc
+++ b/cpp/velox/memory/VeloxMemoryManager.cc
@@ -126,7 +126,7 @@ class ListenableArbitrator : public velox::memory::MemoryArbitrator {
   uint64_t shrinkCapacity(uint64_t targetBytes, bool allowSpill, bool allowAbort) override {
     velox::memory::ScopedMemoryArbitrationContext ctx{};
     facebook::velox::exec::MemoryReclaimer::Stats status;
-    velox::memory::MemoryPool* pool;
+    velox::memory::MemoryPool* pool = nullptr;
     {
       std::unique_lock guard{mutex_};
       VELOX_CHECK_EQ(candidates_.size(), 1, "ListenableArbitrator should only be used within a single root pool");
@@ -178,7 +178,7 @@ class ListenableArbitrator : public velox::memory::MemoryArbitrator {
     return freeBytes;
   }
 
-  gluten::AllocationListener* listener_;
+  gluten::AllocationListener* listener_ = nullptr;
   const uint64_t memoryPoolInitialCapacity_; // FIXME: Unused.
   const uint64_t memoryPoolTransferCapacity_;
   const uint64_t memoryReclaimMaxWaitMs_;
@@ -216,6 +216,7 @@ class ArbitratorFactoryRegister {
 
 VeloxMemoryManager::VeloxMemoryManager(const std::string& kind, std::unique_ptr<AllocationListener> listener)
     : MemoryManager(kind), listener_(std::move(listener)) {
+  GLUTEN_CHECK(listener_ != nullptr, "VeloxMemoryManager failed");
   auto reservationBlockSize = VeloxBackend::get()->getBackendConf()->get<uint64_t>(
       kMemoryReservationBlockSize, kMemoryReservationBlockSizeDefault);
   auto memInitCapacity =