diff --git a/ml_profiler.cpp b/ml_profiler.cpp
index 873ec0a..bb88149 100644
--- a/ml_profiler.cpp
+++ b/ml_profiler.cpp
@@ -10,12 +10,18 @@
 
 using namespace std::chrono;
 
+
 void MlPerfMon::turnOn() {
     perfOn = true;
     start_time = std::chrono::high_resolution_clock::now();
 }
 
 void MlPerfMon::add_method_call(const std::string &method) {
+    std::thread::id this_id = std::this_thread::get_id();
+    // only main thread is logged, to prevent mixing from others threads so lock not needed
+    if (main_thread_id != this_id)
+        return;
+
     call_stack.push_back(method);
 
     if (perfOn) {
@@ -29,6 +35,11 @@ void MlPerfMon::add_method_call(const std::string &method) {
 }
 
 void MlPerfMon::end_method_call() {
+    std::thread::id this_id = std::this_thread::get_id();
+    // only main thread is looged, to prevent mixing from others threads so lock not needed
+    if (main_thread_id != this_id)
+        return;
+
     if (!call_stack.empty()){
         call_stack.pop_back();
     }    
diff --git a/ml_profiler.h b/ml_profiler.h
index 31257b1..a4e45de 100644
--- a/ml_profiler.h
+++ b/ml_profiler.h
@@ -5,6 +5,9 @@
 #include <unordered_map>
 #include <deque>
 #include <chrono>
+#include <thread>
+#include <mutex>
+
 
 static const int method_name_print_len = 15;
 static const int print_top_methods = 15;
@@ -13,7 +16,9 @@ static const int call_stack_max_methods = 10;
 class MlPerfMon {
 
 private:
-    MlPerfMon() : perfOn(false) {};
+    MlPerfMon() : perfOn(false) {
+        main_thread_id = std::this_thread::get_id();
+    };
 
 public:
 
@@ -36,4 +41,5 @@ private:
     std::unordered_map<std::string, long> calls_counter;
     std::chrono::time_point<std::chrono::high_resolution_clock> start_time;
     std::deque<std::string> call_stack;
+    std::thread::id main_thread_id;
 };