diff --git a/inference-engine/src/inference_engine/ie_network_reader.cpp b/inference-engine/src/inference_engine/ie_network_reader.cpp
index 904f7d2a6e3..4f7c4e78b9b 100644
--- a/inference-engine/src/inference_engine/ie_network_reader.cpp
+++ b/inference-engine/src/inference_engine/ie_network_reader.cpp
@@ -7,7 +7,6 @@
 
 #include <details/ie_so_pointer.hpp>
 #include <file_utils.h>
-#include <ie_blob_stream.hpp>
 #include <ie_reader.hpp>
 #include <ie_ir_version.hpp>
 
@@ -239,7 +238,6 @@ CNNNetwork details::ReadNetwork(const std::string& model, const Blob::CPtr& weig
     // Register readers if it is needed
     registerReaders();
     std::istringstream modelStream(model);
-    details::BlobStream binStream(weights);
 
     assertIfIRv7LikeModel(modelStream);
 
diff --git a/inference-engine/src/readers/CMakeLists.txt b/inference-engine/src/readers/CMakeLists.txt
index d0e8b070c4b..a440405cd53 100644
--- a/inference-engine/src/readers/CMakeLists.txt
+++ b/inference-engine/src/readers/CMakeLists.txt
@@ -11,11 +11,8 @@ target_include_directories(${TARGET_NAME} INTERFACE
     $<TARGET_PROPERTY:inference_engine,INTERFACE_INCLUDE_DIRECTORIES>)
 
 file(GLOB_RECURSE reader_api_hpp "${CMAKE_CURRENT_SOURCE_DIR}/reader_api/*.hpp")
-file(GLOB_RECURSE reader_api_src "${CMAKE_CURRENT_SOURCE_DIR}/reader_api/*.cpp")
 
-set_target_properties(${TARGET_NAME} PROPERTIES INTERFACE_SOURCES ${reader_api_src})
-
-add_cpplint_target(${TARGET_NAME}_cpplint FOR_SOURCES ${reader_api_hpp} ${reader_api_src})
+add_cpplint_target(${TARGET_NAME}_cpplint FOR_SOURCES ${reader_api_hpp})
 
 add_subdirectory(ir_reader)
 add_subdirectory(ir_reader_v7)
diff --git a/inference-engine/src/readers/ir_reader/ie_ir_parser.cpp b/inference-engine/src/readers/ir_reader/ie_ir_parser.cpp
index ca10e17220d..213f50f78b2 100644
--- a/inference-engine/src/readers/ir_reader/ie_ir_parser.cpp
+++ b/inference-engine/src/readers/ir_reader/ie_ir_parser.cpp
@@ -29,7 +29,6 @@
 #include <ie_ngraph_utils.hpp>
 #include "blob_factory.hpp"
 #include "caseless.hpp"
-#include "ie_blob_stream.hpp"
 #include "precision_utils.h"
 
 using namespace XMLParseUtils;
@@ -1041,4 +1040,4 @@ size_t V10Parser::GenericLayerParams::getRealOutputPortId(size_t id) const {
     }
     THROW_IE_EXCEPTION << "Can not find output port with id " << id << " in layer " << name;
 }
-}  // namespace InferenceEngine
\ No newline at end of file
+}  // namespace InferenceEngine
diff --git a/inference-engine/src/readers/ir_reader/ie_ir_version.hpp b/inference-engine/src/readers/ir_reader/ie_ir_version.hpp
index 610be4942e6..d7292e1b862 100644
--- a/inference-engine/src/readers/ir_reader/ie_ir_version.hpp
+++ b/inference-engine/src/readers/ir_reader/ie_ir_version.hpp
@@ -45,4 +45,4 @@ size_t GetIRVersion(std::istream& model) {
 }
 
 }  // namespace details
-}  // namespace InferenceEngine
\ No newline at end of file
+}  // namespace InferenceEngine
diff --git a/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp b/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp
index 6ca81888bf3..3670fbda243 100644
--- a/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp
+++ b/inference-engine/src/readers/ir_reader_v7/ie_cnn_net_reader_impl.cpp
@@ -5,7 +5,6 @@
 #include <file_utils.h>
 #include <description_buffer.hpp>
 #include <ie_cnn_net_reader_impl.h>
-#include <ie_blob_stream.hpp>
 
 #include <fstream>
 #include <map>
diff --git a/inference-engine/src/readers/ir_reader_v7/ie_ir_parser.cpp b/inference-engine/src/readers/ir_reader_v7/ie_ir_parser.cpp
index 5bd95e6e32d..fc72c14b813 100644
--- a/inference-engine/src/readers/ir_reader_v7/ie_ir_parser.cpp
+++ b/inference-engine/src/readers/ir_reader_v7/ie_ir_parser.cpp
@@ -4,7 +4,6 @@
 
 #include "ie_reader.hpp"
 #include "ie_ir_parser.hpp"
-#include "ie_blob_stream.hpp"
 #include "ie_cnn_net_reader_impl.h"
 
 using namespace InferenceEngine;
diff --git a/inference-engine/src/readers/reader_api/ie_blob_stream.cpp b/inference-engine/src/readers/reader_api/ie_blob_stream.cpp
deleted file mode 100644
index fb565cb56c3..00000000000
--- a/inference-engine/src/readers/reader_api/ie_blob_stream.cpp
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright (C) 2018-2020 Intel Corporation
-// SPDX-License-Identifier: Apache-2.0
-//
-
-#include "ie_blob_stream.hpp"
-
-#include <ie_blob.h>
-#include <istream>
-
-InferenceEngine::details::BlobStream::BlobBuffer::BlobBuffer(const InferenceEngine::Blob::CPtr& blob) {
-    char* data = nullptr;
-    std::streampos size;
-    if (!blob) {
-        size = 0;
-    } else {
-        data = blob->cbuffer().as<char*>();
-        size = blob->byteSize();
-    }
-    setg(data, data, data + size);
-}
-InferenceEngine::details::BlobStream::BlobBuffer::~BlobBuffer() {}
-
-std::streampos InferenceEngine::details::BlobStream::BlobBuffer::seekpos(std::streampos sp, std::ios_base::openmode which) {
-    if (!(which & ios_base::in))
-        return streampos(-1);
-    if (sp < 0 || sp > egptr() - eback())
-        return streampos(-1);
-    setg(eback(), eback() + sp, egptr());
-    return sp;
-}
-std::streampos InferenceEngine::details::BlobStream::BlobBuffer::seekoff(std::streamoff off, std::ios_base::seekdir way, std::ios_base::openmode which) {
-    if (!(which & std::ios_base::in))
-        return streampos(-1);
-    switch (way) {
-    default:
-    case std::ios_base::beg:
-        setg(eback(), eback() + off, egptr());
-        break;
-    case std::ios_base::cur:
-        gbump(static_cast<int>(off));
-        break;
-    case std::ios_base::end:
-        setg(eback(), egptr() + off, egptr());
-        break;
-    }
-    return gptr() - eback();
-}
-
-InferenceEngine::Blob::CPtr InferenceEngine::details::BlobStream::getBlob() {
-    return blob;
-}
-
-
-#if defined __GNUC__
-# pragma GCC diagnostic push
-# pragma GCC diagnostic ignored "-Wreorder"
-#endif
-
-InferenceEngine::details::BlobStream::BlobStream(const InferenceEngine::Blob::CPtr& blob) :
-    buffer(blob), std::ios(0), std::istream(&buffer), blob(blob) {}
-
-#if defined __GNUC__
-# pragma GCC diagnostic pop
-#endif
-
-InferenceEngine::details::BlobStream::~BlobStream() {}
diff --git a/inference-engine/src/readers/reader_api/ie_blob_stream.hpp b/inference-engine/src/readers/reader_api/ie_blob_stream.hpp
deleted file mode 100644
index 53dbabe2176..00000000000
--- a/inference-engine/src/readers/reader_api/ie_blob_stream.hpp
+++ /dev/null
@@ -1,44 +0,0 @@
-// Copyright (C) 2018-2020 Intel Corporation
-// SPDX-License-Identifier: Apache-2.0
-//
-
-#pragma once
-
-#include <ie_blob.h>
-#include <istream>
-
-namespace InferenceEngine {
-namespace details {
-
-class BlobStream: public std::istream {
-private:
-    class BlobBuffer: public std::streambuf {
-    public:
-        BlobBuffer(const Blob::CPtr& blob);
-        ~BlobBuffer() override;
-        std::streampos seekpos(std::streampos sp, std::ios_base::openmode which) override;
-        std::streampos seekoff(std::streamoff off, std::ios_base::seekdir way, std::ios_base::openmode which) override;
-    };
-
-#if defined __GNUC__
-# pragma GCC diagnostic push
-# pragma GCC diagnostic ignored "-Wreorder"
-#endif
-
-    BlobBuffer buffer;
-    Blob::CPtr blob;
-
-#if defined __GNUC__
-# pragma GCC diagnostic pop
-#endif
-
-public:
-    BlobStream(const Blob::CPtr& blob);
-    ~BlobStream() override;
-
-    Blob::CPtr getBlob();
-};
-
-
-}  // namespace details
-}  // namespace InferenceEngine
diff --git a/ngraph/core/include/ngraph/op/constant.hpp b/ngraph/core/include/ngraph/op/constant.hpp
index 749f94f2de1..8be8ef1c7a3 100644
--- a/ngraph/core/include/ngraph/op/constant.hpp
+++ b/ngraph/core/include/ngraph/op/constant.hpp
@@ -351,6 +351,8 @@ namespace ngraph
                 std::vector<T> get_vector() const
                 {
                     const T* p = get_data_ptr<T>();
+                    if (p == nullptr)
+                        throw std::runtime_error("Cannot create vector! Buffer is not allocated.");
                     return std::vector<T>(p, p + shape_size(m_shape));
                 }
 
diff --git a/ngraph/core/src/op/squeeze.cpp b/ngraph/core/src/op/squeeze.cpp
index 42f0bcf1c60..4681bea3430 100644
--- a/ngraph/core/src/op/squeeze.cpp
+++ b/ngraph/core/src/op/squeeze.cpp
@@ -53,10 +53,11 @@ void op::Squeeze::pre_validate_and_infer_types()
     bool data_has_dynamic_shape = data.get_partial_shape().is_dynamic();
 
     auto axes_constant = get_constant_from_source(axes_node);
-    bool axes_is_empty_constant =
-        (axes_constant) ? axes_constant->cast_vector<int64_t>().empty() : false;
+    bool axes_is_empty_constant = (axes_constant && axes_constant->get_data_ptr() != nullptr)
+                                      ? axes_constant->cast_vector<int64_t>().empty()
+                                      : false;
 
-    if (data_has_dynamic_rank || !axes_constant ||
+    if (data_has_dynamic_rank || !axes_constant || !axes_constant->get_data_ptr() ||
         (data_has_dynamic_shape && axes_is_empty_constant))
     {
         set_output_type(0, get_input_element_type(0), PartialShape::dynamic());