diff --git a/libwvdrmengine/mediacrypto/src_hidl/WVCryptoPlugin.cpp b/libwvdrmengine/mediacrypto/src_hidl/WVCryptoPlugin.cpp
index e755405d..b6abfc23 100644
--- a/libwvdrmengine/mediacrypto/src_hidl/WVCryptoPlugin.cpp
+++ b/libwvdrmengine/mediacrypto/src_hidl/WVCryptoPlugin.cpp
@@ -98,7 +98,11 @@ Return<Status> WVCryptoPlugin::setMediaDrmSession(
 
 Return<void> WVCryptoPlugin::setSharedBufferBase(
     const hidl_memory& base, uint32_t bufferId) {
-  mSharedBufferMap[bufferId] = mapMemory(base);
+  sp<IMemory> hidlMemory = mapMemory(base);
+  ALOGE_IF(hidlMemory == nullptr, "mapMemory returns nullptr");
+
+  // allow mapMemory to return nullptr
+  mSharedBufferMap[bufferId] = hidlMemory;
   return Void();
 }
 
@@ -144,6 +148,10 @@ Return<void> WVCryptoPlugin::decrypt(
 
   std::string errorDetailMsg;
   sp<IMemory> sourceBase = mSharedBufferMap[source.bufferId];
+  if (sourceBase == nullptr) {
+    _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source is a nullptr");
+    return Void();
+  }
 
   if (source.offset + offset + source.size > sourceBase->getSize()) {
     _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size");
@@ -157,6 +165,11 @@ Return<void> WVCryptoPlugin::decrypt(
   if (destination.type == BufferType::SHARED_MEMORY) {
     const SharedBuffer& destBuffer = destination.nonsecureMemory;
     sp<IMemory> destBase = mSharedBufferMap[destBuffer.bufferId];
+    if (destBase == nullptr) {
+      _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination is a nullptr");
+      return Void();
+    }
+
     if (destBuffer.offset + destBuffer.size > destBase->getSize()) {
       _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size");
       return Void();