diff --git a/trunk/doc/CHANGELOG.md b/trunk/doc/CHANGELOG.md
index 498b56eb6..b231ffbca 100644
--- a/trunk/doc/CHANGELOG.md
+++ b/trunk/doc/CHANGELOG.md
@@ -8,6 +8,7 @@ The changelog for SRS.
 
 ## SRS 4.0 Changelog
 
+* v4.0, 2023-08-02, Fix [#3749](https://github.com/ossrs/srs/issues/3749): HLS: Ignore empty NALU to avoid error. v4.0.271
 * v4.0, 2023-07-21, Merge [#3695](https://github.com/ossrs/srs/pull/3695): API: Fix HTTPS callback issue using SNI in TLS client handshake. v4.0.270 (#3695)
 * v4.0, 2022-12-24, For [#296](https://github.com/ossrs/srs/issues/296): MP3: Fix bug for TS or HLS with mp3 codec. v4.0.269
 * v4.0, 2022-11-22, Pick [#3079](https://github.com/ossrs/srs/issues/3079): WebRTC: Fix no audio and video issue for Firefox. v4.0.268
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index a65c030f9..a732dd21e 100644
--- a/trunk/src/core/srs_core_version4.hpp
+++ b/trunk/src/core/srs_core_version4.hpp
@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       4
 #define VERSION_MINOR       0
-#define VERSION_REVISION    270
+#define VERSION_REVISION    271
 
 #endif
diff --git a/trunk/src/kernel/srs_kernel_codec.cpp b/trunk/src/kernel/srs_kernel_codec.cpp
index 12c8b59cd..bf50ab6ef 100644
--- a/trunk/src/kernel/srs_kernel_codec.cpp
+++ b/trunk/src/kernel/srs_kernel_codec.cpp
@@ -544,6 +544,8 @@ srs_error_t SrsVideoFrame::add_sample(char* bytes, int size)
     if ((err = SrsFrame::add_sample(bytes, size)) != srs_success) {
         return srs_error_wrap(err, "add frame");
     }
+
+    if (!bytes || size <= 0) return err;
     
     // for video, parse the nalu type, set the IDR flag.
     SrsAvcNaluType nal_unit_type = (SrsAvcNaluType)(bytes[0] & 0x1f);