diff --git a/mindspore/lite/src/weight_decoder.cc b/mindspore/lite/src/weight_decoder.cc
index b90e8e78d10..f1dbeecd8ca 100644
--- a/mindspore/lite/src/weight_decoder.cc
+++ b/mindspore/lite/src/weight_decoder.cc
@@ -234,9 +234,13 @@ int WeightDecoder::DecodeHuffmanCode(const schema::Tensor &src_tensor, lite::Ten
   if (!dst_tensor->IsConst() || !src_tensor.enableHuffmanCode()) {
     return RET_NO_CHANGE;
   }
-  MS_ASSERT(src_tensor.data() != nullptr);
+  if (src_tensor.data() == nullptr) {
+    return RET_NO_CHANGE;
+  }
   auto data = reinterpret_cast<const char *>(src_tensor.data()->data());
-  MS_ASSERT(data != nullptr);
+  if (data == nullptr) {
+    return RET_NO_CHANGE;
+  }
   std::string encode_str(data, src_tensor.data()->size());
   dst_tensor->set_data(nullptr);
   auto ret = dst_tensor->MallocData();
diff --git a/mindspore/lite/src/weight_decoder.h b/mindspore/lite/src/weight_decoder.h
index 6a564a0cb8a..93231798cdb 100644
--- a/mindspore/lite/src/weight_decoder.h
+++ b/mindspore/lite/src/weight_decoder.h
@@ -221,7 +221,7 @@ class WeightDecoder {
     while (static_cast<int>(unpack_bit_data->size()) >= origin_bit) {
       for (int k = 0; k < origin_bit; k++) {
         bool bit_tmp = unpack_bit_data->front();
-        uint_result = (static_cast<int>(bit_tmp) << k) + uint_result;
+        uint_result = (static_cast<int>(bit_tmp) << static_cast<unsigned int>(k)) + uint_result;
         unpack_bit_data->pop();
       }
       result = uint_result - static_cast<T2>(pow(2, origin_bit - 1));