diff --git a/include/dxfeed_graal_cpp_api/isolated/api/IsolatedDXFeedSubscription.hpp b/include/dxfeed_graal_cpp_api/isolated/api/IsolatedDXFeedSubscription.hpp
index 45bd494f..d127b828 100644
--- a/include/dxfeed_graal_cpp_api/isolated/api/IsolatedDXFeedSubscription.hpp
+++ b/include/dxfeed_graal_cpp_api/isolated/api/IsolatedDXFeedSubscription.hpp
@@ -17,15 +17,6 @@ namespace isolated::api::IsolatedDXFeedSubscription {
 
 /*
 
-int32_t                   dxfg_DXFeedSubscription_removeEventListener(graal_isolatethread_t *thread, dxfg_subscription_t
-*sub, dxfg_feed_event_listener_t *listener);
-
-int32_t                   dxfg_DXFeedSubscription_addSymbol(graal_isolatethread_t *thread, dxfg_subscription_t *sub,
-dxfg_symbol_t *symbol);
-
-int32_t                   dxfg_DXFeedSubscription_addSymbols(graal_isolatethread_t *thread, dxfg_subscription_t *sub,
-dxfg_symbol_list *symbols);
-
 int32_t                   dxfg_DXFeedSubscription_removeSymbol(graal_isolatethread_t *thread, dxfg_subscription_t *sub,
 dxfg_symbol_t *symbol);
 
@@ -112,19 +103,32 @@ addEventListener(/* dxfg_subscription_t * */ const JavaObjectHandle<DXFeedSubscr
 
 // int32_t dxfg_DXFeedSubscription_removeEventListener(graal_isolatethread_t *thread, dxfg_subscription_t *sub, dxfg_feed_event_listener_t *listener);
 
-// int32_t dxfg_DXFeedSubscription_addSymbol(graal_isolatethread_t *thread, dxfg_subscription_t *sub, dxfg_symbol_t *symbol);
-
 /**
  * Calls the Graal SDK function `dxfg_DXFeedSubscription_addSymbol` in isolation.
  *
  * @param sub The subscription's handle.
- * @param symbol The symbol.
+ * @param symbol The subscription's symbol.
  * @throws std::invalid_argument if DXFeedSubscription's handle is invalid or the symbol is nullptr.
  * @throws JavaException if something happened with the dxFeed API backend.
  * @throws GraalException if something happened with the GraalVM.
  */
 void /* int32_t */ addSymbol(/* dxfg_subscription_t * */ const JavaObjectHandle<DXFeedSubscription> &sub, /* dxfg_symbol_t * */ void* symbol);
 
+// int32_t                   dxfg_DXFeedSubscription_addSymbols(graal_isolatethread_t *thread, dxfg_subscription_t *sub,
+// dxfg_symbol_list *symbols);
+
+/**
+ * Calls the Graal SDK function `dxfg_DXFeedSubscription_addSymbols` in isolation.
+ *
+ * @param sub The subscription's handle.
+ * @param symbols The subscription's symbols.
+ * @throws std::invalid_argument if DXFeedSubscription's handle is invalid or the symbols is nullptr.
+ * @throws JavaException if something happened with the dxFeed API backend.
+ * @throws GraalException if something happened with the GraalVM.
+ */
+void /* int32_t */ addSymbols(/* dxfg_subscription_t * */ const JavaObjectHandle<DXFeedSubscription> &sub, /* dxfg_symbol_list * */ void* symbols);
+
+
 /**
  * Calls the Graal SDK function `dxfg_DXFeedSubscription_addChangeListener` in isolation.
  *
diff --git a/src/api/DXFeedSubscription.cpp b/src/api/DXFeedSubscription.cpp
index e6b62633..a68fead3 100644
--- a/src/api/DXFeedSubscription.cpp
+++ b/src/api/DXFeedSubscription.cpp
@@ -90,16 +90,7 @@ void DXFeedSubscription::addSymbolImpl(void *graalSymbol) const {
 }
 
 void DXFeedSubscription::addSymbolsImpl(void *graalSymbolList) const {
-    if (!handle_) {
-        return;
-    }
-
-    runIsolatedOrElse(
-        [handle = static_cast<dxfg_subscription_t *>(handle_.get()), graalSymbolList](auto threadHandle) {
-            return dxfg_DXFeedSubscription_addSymbols(static_cast<graal_isolatethread_t *>(threadHandle), handle,
-                                                      static_cast<dxfg_symbol_list *>(graalSymbolList)) == 0;
-        },
-        false);
+    isolated::api::IsolatedDXFeedSubscription::addSymbols(handle_, graalSymbolList);
 }
 
 void DXFeedSubscription::removeSymbolImpl(void *graalSymbol) const {
diff --git a/src/isolated/api/IsolatedDXFeedSubscription.cpp b/src/isolated/api/IsolatedDXFeedSubscription.cpp
index f4d37317..749bc9dc 100644
--- a/src/isolated/api/IsolatedDXFeedSubscription.cpp
+++ b/src/isolated/api/IsolatedDXFeedSubscription.cpp
@@ -71,6 +71,22 @@ void /* int32_t */ addSymbol(/* dxfg_subscription_t * */ const JavaObjectHandle<
                                            static_cast<dxfg_symbol_t *>(symbol));
 }
 
+void /* int32_t */ addSymbols(/* dxfg_subscription_t * */ const JavaObjectHandle<DXFeedSubscription> &sub, /* dxfg_symbol_list * */ void* symbols) {
+    if (!sub) {
+        throw std::invalid_argument(
+            "Unable to execute function `dxfg_DXFeedSubscription_addSymbols`. The `sub` handle is invalid");
+    }
+
+    if (!symbols) {
+        throw std::invalid_argument("Unable to execute function `dxfg_DXFeedSubscription_addSymbols`. The "
+                                    "`symbols` is nullptr");
+    }
+
+    runGraalFunctionAndThrowIfLessThanZero(dxfg_DXFeedSubscription_addSymbols,
+                                           static_cast<dxfg_subscription_t *>(sub.get()),
+                                           static_cast<dxfg_symbol_list *>(symbols));
+}
+
 void /* int32_t */ addChangeListener(
     /* dxfg_subscription_t * */ const JavaObjectHandle<DXFeedSubscription> &sub,
     /* dxfg_observable_subscription_change_listener_t * */ const JavaObjectHandle<ObservableSubscriptionChangeListener>