diff --git a/src/etcp_connections.c b/src/etcp_connections.c
index cacaab5..c87b62d 100644
--- a/src/etcp_connections.c
+++ b/src/etcp_connections.c
@@ -114,7 +114,7 @@ static void etcp_link_send_init(struct ETCP_LINK* link, uint8_t reset) {
 static void etcp_link_init_timer_cbk(void* arg) {
     DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "");
     struct ETCP_LINK* link = (struct ETCP_LINK*)arg;
-    if (!link) return;
+    if (!link || !link->etcp || !link->etcp->instance) return;
 
     if ((link->init_retry_count % 10) == 0 && link->init_timeout < INIT_TIMEOUT_MAX) {
         link->init_timeout += link->init_timeout/4 +1;
@@ -219,7 +219,7 @@ static void keepalive_timer_cb(void* arg) {
     if (!link || !link->etcp || !link->etcp->instance) {
         DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "KEEPALIVE NULL !!!!!!!!");
         return;
-        }
+    }
 
     link->keepalive_timer = NULL;
 
@@ -717,7 +717,7 @@ void start_stats_timer(struct ETCP_LINK* link) {
 // === Новый callback таймера ===
 static void link_stats_timer_cb(void* arg) {
     struct ETCP_LINK* link = (struct ETCP_LINK*)arg;
-    if (!link || !link->etcp) return;
+    if (!link || !link->etcp || !link->etcp->instance) return;
 
     // 1. Сохраняем снимок текущего окна
     link->stat_win[link->win_ptr].rtt           = link->rtt_avg10;
diff --git a/tests/test_etcp_two_instances.c b/tests/test_etcp_two_instances.c
index 462fd81..9789916 100644
--- a/tests/test_etcp_two_instances.c
+++ b/tests/test_etcp_two_instances.c
@@ -248,6 +248,26 @@ static void test_timeout(void* arg) {
     }
 }
 
+static void cleanup_instance_timers(struct UTUN_INSTANCE* instance, struct UASYNC* ua) {
+    if (!instance || !ua) return;
+    struct ETCP_CONN* conn = instance->connections;
+    while (conn) {
+        struct ETCP_LINK* link = conn->links;
+        while (link) {
+            if (link->keepalive_timer) {
+                uasync_cancel_timeout(ua, link->keepalive_timer);
+                link->keepalive_timer = NULL;
+            }
+            if (link->init_timer) {
+                uasync_cancel_timeout(ua, link->init_timer);
+                link->init_timer = NULL;
+            }
+            link = link->next;
+        }
+        conn = conn->next;
+    }
+}
+
 int main() {
     // Create temp config files first
     if (create_temp_configs() != 0) {
@@ -382,6 +402,10 @@ int main() {
         // uasync_print_resources(ua, "SHARED"); // disabled to prevent potential null deref with TUN disabled
     }
 
+    // Explicit timer cleanup for all links (without changing library)
+    if (server_instance && ua) cleanup_instance_timers(server_instance, ua);
+    if (client_instance && ua) cleanup_instance_timers(client_instance, ua);
+
     // Stop and destroy instances (safe for TUN-disabled mode)
     if (server_instance) {
         server_instance->running = 0;