diff --git a/projects/mtg/include/MTGDeck.h b/projects/mtg/include/MTGDeck.h
index 247598948..e7e27fc20 100644
--- a/projects/mtg/include/MTGDeck.h
+++ b/projects/mtg/include/MTGDeck.h
@@ -134,31 +134,40 @@ public:
 
     static int findType(string subtype, bool forceAdd = true) {
         boost::mutex::scoped_lock lock(instance->mMutex);
-        return instance->subtypesList.find(subtype, forceAdd);
+		int result = instance->subtypesList.find(subtype, forceAdd);
+        return result;
     };
     static int add(string value, unsigned int parentType) {
         boost::mutex::scoped_lock lock(instance->mMutex);
-        return instance->subtypesList.add(value, parentType);
+        int result = instance->subtypesList.add(value, parentType);
+        return result;
     };
     static string findType(unsigned int id) {
+        boost::mutex::scoped_lock lock(instance->mMutex);
         return instance->subtypesList.find(id);
     };
     static const vector<string>& getValuesById() {
+        boost::mutex::scoped_lock lock(instance->mMutex);
         return instance->subtypesList.getValuesById();
     };
     static const vector<string>& getCreatureValuesById() {
+        boost::mutex::scoped_lock lock(instance->mMutex);
         return instance->subtypesList.getCreatureValuesById();
     };
     static bool isSubtypeOfType(unsigned int subtype, unsigned int type) {
+        boost::mutex::scoped_lock lock(instance->mMutex);
         return instance->subtypesList.isSubtypeOfType(subtype, type);
     };
     static bool isSuperType(unsigned int type) {
+        boost::mutex::scoped_lock lock(instance->mMutex);
         return instance->subtypesList.isSuperType(type);
     };
     static bool isType(unsigned int type) {
+        boost::mutex::scoped_lock lock(instance->mMutex);
         return instance->subtypesList.isType(type);
     };
     static bool isSubType(unsigned int type) {
+        boost::mutex::scoped_lock lock(instance->mMutex);
         return instance->subtypesList.isSubType(type);
     };