diff --git a/indexer/data_header.cpp b/indexer/data_header.cpp
index be6c79961c..a6f2c413bf 100644
--- a/indexer/data_header.cpp
+++ b/indexer/data_header.cpp
@@ -105,8 +105,16 @@ namespace feature
     LoadBytes(src, m_langs);
 
     m_type = static_cast<MapType>(ReadVarInt<int32_t>(src));
-
     m_ver = ver;
+
+    if (!IsMWMSuitable())
+    {
+      // Actually, old versions of the app should read mwm header correct!
+      // This condition is also checked in adding mwm to the model.
+      return;
+    }
+
+    // Place all new serializable staff here.
   }
 
   void DataHeader::LoadVer1(ModelReaderPtr const & r)
diff --git a/indexer/data_header.hpp b/indexer/data_header.hpp
index 88a80d555e..499fde49ba 100644
--- a/indexer/data_header.hpp
+++ b/indexer/data_header.hpp
@@ -67,7 +67,9 @@ namespace feature
       v3,         // March 2013 (store type index, instead of raw type in search data)
       lastVersion = v3
     };
+
     inline Version GetVersion() const { return m_ver; }
+    inline bool IsMWMSuitable() const { return (m_ver <= lastVersion); }
 
     /// @name Serialization
     //@{
@@ -77,7 +79,8 @@ namespace feature
     void LoadVer1(ModelReaderPtr const & r);
     //@}
 
-    enum MapType {
+    enum MapType
+    {
       world,
       worldcoasts,
       country
diff --git a/indexer/index.cpp b/indexer/index.cpp
index 788b08b47d..97341209cd 100644
--- a/indexer/index.cpp
+++ b/indexer/index.cpp
@@ -44,18 +44,25 @@ int Index::GetInfo(string const & name, MwmInfo & info) const
   MwmValue value(name);
 
   feature::DataHeader const & h = value.GetHeader();
-  info.m_limitRect = h.GetBounds();
+  if (h.IsMWMSuitable())
+  {
+    info.m_limitRect = h.GetBounds();
 
-  pair<int, int> const scaleR = h.GetScaleRange();
-  info.m_minScale = static_cast<uint8_t>(scaleR.first);
-  info.m_maxScale = static_cast<uint8_t>(scaleR.second);
+    pair<int, int> const scaleR = h.GetScaleRange();
+    info.m_minScale = static_cast<uint8_t>(scaleR.first);
+    info.m_maxScale = static_cast<uint8_t>(scaleR.second);
 
-  return h.GetVersion();
+    return h.GetVersion();
+  }
+  else
+    return -1;
 }
 
 MwmValue * Index::CreateValue(string const & name) const
 {
-  return new MwmValue(name);
+  MwmValue * p = new MwmValue(name);
+  ASSERT(p->GetHeader().IsMWMSuitable(), ());
+  return p;
 }
 
 Index::Index()
diff --git a/indexer/mwm_set.cpp b/indexer/mwm_set.cpp
index 9477616b4a..eec0568253 100644
--- a/indexer/mwm_set.cpp
+++ b/indexer/mwm_set.cpp
@@ -130,6 +130,8 @@ int MwmSet::AddImpl(string const & fileName, m2::RectD & rect)
   // this function can throw an exception for bad mwm file
   MwmInfo info;
   int const version = GetInfo(fileName, info);
+  if (version == -1)
+    return -1;
 
   info.m_status = MwmInfo::STATUS_ACTIVE;
 
diff --git a/map/feature_vec_model.cpp b/map/feature_vec_model.cpp
index 537117641d..958394e8b1 100644
--- a/map/feature_vec_model.cpp
+++ b/map/feature_vec_model.cpp
@@ -35,14 +35,16 @@ void FeaturesFetcher::InitClassificator()
 int FeaturesFetcher::AddMap(string const & file)
 {
   int version = -1;
+
   try
   {
     m2::RectD r;
     version = m_multiIndex.Add(file, r);
 
-    // For debug purposes - add rect for countries only (press 'A' in map view).
-    //if (file.find("World") == string::npos)
+    if (version != -1)
       m_rect.Add(r);
+    else
+      LOG(LWARNING, ("Can't add map", file, "Probably it's already added or has newer data version."));
   }
   catch (RootException const & e)
   {
diff --git a/map/framework.cpp b/map/framework.cpp
index 7f31006203..a86cb8a696 100644
--- a/map/framework.cpp
+++ b/map/framework.cpp
@@ -70,26 +70,29 @@ void Framework::AddMap(string const & file)
 {
   LOG(LINFO, ("Loading map:", file));
 
-  //threads::MutexGuard lock(m_modelSyn);
   int const version = m_model.AddMap(file);
-
-  // Now we do force delete of old (April 2011) maps.
-  if (version == feature::DataHeader::v1)
+  switch (version)
   {
+  case -1:
+    // Error in adding map - do nothing.
+    break;
+
+  case feature::DataHeader::v1:
+    // Now we do force delete of old (April 2011) maps.
     LOG(LINFO, ("Deleting old map:", file));
     RemoveMap(file);
     VERIFY ( my::DeleteFileX(GetPlatform().WritablePathForFile(file)), () );
-  }
-  else
-  {
+    break;
+
+  default:
     if (m_lowestMapVersion > version)
       m_lowestMapVersion = version;
+    break;
   }
 }
 
 void Framework::RemoveMap(string const & file)
 {
-  //threads::MutexGuard lock(m_modelSyn);
   m_model.RemoveMap(file);
 }
 
diff --git a/map/framework.hpp b/map/framework.hpp
index bbae403525..b1bbe41846 100644
--- a/map/framework.hpp
+++ b/map/framework.hpp
@@ -111,8 +111,6 @@ protected:
 
   void StopLocationFollow();
 
-  //mutable threads::Mutex m_modelSyn;
-
   storage::Storage m_storage;
   scoped_ptr<gui::Controller> m_guiController;
   scoped_ptr<anim::Controller> m_animController;