diff --git a/esphome/components/web_server_idf/web_server_idf.cpp b/esphome/components/web_server_idf/web_server_idf.cpp
index bbaca95324..84386b227f 100644
--- a/esphome/components/web_server_idf/web_server_idf.cpp
+++ b/esphome/components/web_server_idf/web_server_idf.cpp
@@ -472,10 +472,10 @@ void AsyncResponseStream::printf(const char *fmt, ...) {
 
 #ifdef USE_WEBSERVER
 AsyncEventSource::~AsyncEventSource() {
+  LockGuard guard{this->pending_mutex_};
   for (auto *ses : this->sessions_) {
     delete ses;  // NOLINT(cppcoreguidelines-owning-memory)
   }
-  LockGuard guard{this->pending_mutex_};
   for (auto *ses : this->pending_sessions_) {
     delete ses;  // NOLINT(cppcoreguidelines-owning-memory)
   }