diff --git a/source/MRMesh/MRTimer.cpp b/source/MRMesh/MRTimer.cpp
index e52370ac2959..9214c3749190 100644
--- a/source/MRMesh/MRTimer.cpp
+++ b/source/MRMesh/MRTimer.cpp
@@ -124,6 +124,7 @@ void Timer::start( const std::string& name )
 {
     if ( std::this_thread::get_id() != mainThreadId )
         return;
+    started_ = true;
     start_ = high_resolution_clock::now();
     auto parent = currentRecord;
     currentRecord = &parent->children[name];
@@ -132,6 +133,8 @@ void Timer::start( const std::string& name )
 
 void Timer::finish()
 {
+    if ( !started_ )
+        return;
     auto currentParent = currentRecord->parent;
     if ( !currentParent )
         return;
diff --git a/source/MRMesh/MRTimer.h b/source/MRMesh/MRTimer.h
index a53633a784e6..7d829b70b3b0 100644
--- a/source/MRMesh/MRTimer.h
+++ b/source/MRMesh/MRTimer.h
@@ -31,6 +31,7 @@ class Timer
 
 private:
     std::chrono::time_point<std::chrono::high_resolution_clock> start_;
+    bool started_{ false };
 };
 
 /// enables or disables printing of timing tree when application terminates