diff --git a/src/delegator.cpp b/src/delegator.cpp
index b8a59f58760396d2000427771f47b1786f0d4940..9f128dbcbbc83268206a3a187eea55a841dcb978 100644
--- a/src/delegator.cpp
+++ b/src/delegator.cpp
@@ -276,12 +276,26 @@ void Delegator::Finalize() {
   if (!nesmik_on_) {
     return;
   }
+  // Check double finalize
+  if (did_finalize_) {
+    if (mpi_helper_->IsUsingMPI()) {
+      std::cout << "neSmiK Warning: neSmiK already finalized for rank: "
+                << mpi_helper_->getRankNumber() << std::endl;
+    } else {
+      std::cout << "neSmiK Warning: neSmiK already finalized" << std::endl;
+    }
+
+    return;
+  }
+
   switch (backend_selection_) {
     case BackendMode::NotProperlyNested:
-      return npn_annotation_strategy_->Finalize();
+      npn_annotation_strategy_->Finalize();
       break;
     case BackendMode::ProperlyNested:
-      return pn_annotation_strategy_->Finalize();
+      pn_annotation_strategy_->Finalize();
       break;
   }
+
+  did_finalize_ = true;
 };
diff --git a/src/delegator.hpp b/src/delegator.hpp
index a9f0055c94fe339ca509ecb66b7887e27113f297..57ab41d5237968949c69fd5c6d402b1b28a5b1e5 100644
--- a/src/delegator.hpp
+++ b/src/delegator.hpp
@@ -28,6 +28,7 @@ class Delegator {
   inline static BackendMode backend_selection_;
   inline static bool nesmik_on_{false};
   inline static bool did_initialize_{false};
+  inline static bool did_finalize_{false};
 
   inline static std::unique_ptr<MPIHelper> mpi_helper_;