diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a0bd5268..bfd05672c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ The changelog for SRS.
 
 ## SRS 4.0 Changelog
 
+* v4.0, 2021-08-13, RTC: Merge [#2526](https://github.com/ossrs/srs/pull/2526), fix codec issue for G.711 or H.263. 4.0.152
 * v4.0, 2021-08-10, RTC: Merge [#2509](https://github.com/ossrs/srs/pull/2514), support http hooks n_play/stop/publish/unpublish. 4.0.151
 * v4.0, 2021-08-07, Merge [#2514](https://github.com/ossrs/srs/pull/2514), Get original client ip instead of proxy ip, for rtc api #2514. 4.0.150
 * v4.0, 2021-08-07, Fix [#2508](https://github.com/ossrs/srs/pull/2508), Support features query by API. 4.0.149
diff --git a/trunk/src/app/srs_app_dash.cpp b/trunk/src/app/srs_app_dash.cpp
index ef9082cfa..e3ec90a14 100644
--- a/trunk/src/app/srs_app_dash.cpp
+++ b/trunk/src/app/srs_app_dash.cpp
@@ -540,7 +540,11 @@ srs_error_t SrsDash::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* form
     if (!enabled) {
         return err;
     }
-    
+
+    if (!format->acodec) {
+        return err;
+    }
+
     if ((err = controller->on_audio(shared_audio, format)) != srs_success) {
         return srs_error_wrap(err, "Consume audio failed");
     }
@@ -555,7 +559,11 @@ srs_error_t SrsDash::on_video(SrsSharedPtrMessage* shared_video, SrsFormat* form
     if (!enabled) {
         return err;
     }
-    
+
+    if (!format->vcodec) {
+        return err;
+    }
+ 
     if ((err = controller->on_video(shared_video, format)) != srs_success) {
         return srs_error_wrap(err, "Consume video failed");
     }
diff --git a/trunk/src/app/srs_app_source.cpp b/trunk/src/app/srs_app_source.cpp
index e09892c51..aae228b48 100755
--- a/trunk/src/app/srs_app_source.cpp
+++ b/trunk/src/app/srs_app_source.cpp
@@ -931,6 +931,12 @@ srs_error_t SrsOriginHub::on_audio(SrsSharedPtrMessage* shared_audio)
     if ((err = format->on_audio(msg)) != srs_success) {
         return srs_error_wrap(err, "format consume audio");
     }
+
+    // Ignore if no format->acodec, it means the codec is not parsed, or unsupport/unknown codec
+    // such as G.711 codec
+    if (!format->acodec) {
+        return err;
+    }
     
     // cache the sequence header if aac
     // donot cache the sequence header to gop_cache, return here.
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 29d64471e..c0afc04a2 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    151
+#define VERSION_REVISION    152
 
 #endif
diff --git a/trunk/src/kernel/srs_kernel_ts.cpp b/trunk/src/kernel/srs_kernel_ts.cpp
index a6f0d3809..96a95c0ff 100644
--- a/trunk/src/kernel/srs_kernel_ts.cpp
+++ b/trunk/src/kernel/srs_kernel_ts.cpp
@@ -3064,7 +3064,11 @@ srs_error_t SrsTsTransmuxer::write_audio(int64_t timestamp, char* data, int size
     if ((err = format->on_audio(timestamp, data, size)) != srs_success) {
         return srs_error_wrap(err, "ts: format on audio");
     }
-    
+
+    if (!format->acodec) {
+        return err;
+    }
+
     // ts support audio codec: aac/mp3
     srs_assert(format->acodec && format->audio);
     if (format->acodec->id != SrsAudioCodecIdAAC && format->acodec->id != SrsAudioCodecIdMP3) {
@@ -3100,7 +3104,11 @@ srs_error_t SrsTsTransmuxer::write_video(int64_t timestamp, char* data, int size
     if ((err = format->on_video(timestamp, data, size)) != srs_success) {
         return srs_error_wrap(err, "ts: on video");
     }
-    
+
+    if (!format->vcodec) {
+        return err;
+    }
+
     // ignore info frame,
     // @see https://github.com/ossrs/srs/issues/288#issuecomment-69863909
     srs_assert(format->video && format->vcodec);