diff --git a/apps/renderer.c b/apps/renderer.c
index 1be3fec6a9f8c009a46784c809d2146099ca6ce5..753a116c157fadabbb01e81f01d0b9ea1c8f094c 100644
--- a/apps/renderer.c
+++ b/apps/renderer.c
@@ -1449,7 +1449,16 @@ int main(
             audioWriter = NULL;
         }
 
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+        if ( ( error = IVAS_REND_GetSplitRendBitstreamHeader( hIvasRend,
+                                                              &bitsBuffer.config.codec,
+                                                              &bitsBuffer.config.poseCorrection,
+                                                              &bitsBuffer.config.codec_frame_size_ms,
+                                                              &bitsBuffer.config.isar_frame_size_ms,
+                                                              &bitsBuffer.config.lc3plus_highres ) ) != IVAS_ERR_OK )
+#else
         if ( ( error = IVAS_REND_GetSplitRendBitstreamHeader( hIvasRend, &bitsBuffer.config.codec, &bitsBuffer.config.poseCorrection, &bitsBuffer.config.codec_frame_size_ms, &bitsBuffer.config.isar_frame_size_ms ) ) != IVAS_ERR_OK )
+#endif
         {
             fprintf( stderr, "\nError in IVAS_REND_GetSplitRendBitstreamHeader()!\n" );
             goto cleanup;
diff --git a/lib_com/options.h b/lib_com/options.h
index 0c5dfdfd2a74a902992804ce8b714807dc64d33c..1038a3c7ff1a012540fa7c7407b7d07fa8c53435 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -178,6 +178,7 @@
 #define RENDERER_MD_SYNC_DELAY_TO_INTEGER               /* FhG: change data type of metadata sync delay in ext renderer to int16_t for better BASOP portability (and nicer code) */
 #define FIX_1427_OBJ_EDITING_EXT_METADATA               /* Eri: Add support for extended metadata in object editing */
 #define FIX_1419_MONO_STEREO_UMX                        /* FhG: fix for issue 1419 : support upmix to all output formats for mono and stereo */
+#define FIX_1437_LC3PLUS_EXTREND_HIRES                  /* FhG: fix external renderer split bitstream header writing causing a crash for LC3plus High-res mode */
 
 #define FIX_1318_ROOM_SIZE_CMD_LINE                     /* Philips/Nokia: Default room sizes support */
 
diff --git a/lib_isar/isar_splitRendererPre.c b/lib_isar/isar_splitRendererPre.c
index 370e02398d5a9cb2eae31418e531083b7490fd94..bd1c9c1b2dce6c0f1539825a77ca97a752667546 100644
--- a/lib_isar/isar_splitRendererPre.c
+++ b/lib_isar/isar_splitRendererPre.c
@@ -1894,6 +1894,9 @@ ivas_error splitRendLc3plusEncodeAndWrite(
     pBits->pose_correction = hSplitBin->multiBinPoseData.poseCorrectionMode;
     pBits->codec_frame_size_ms = (int16_t) ( hSplitBin->hLc3plusEnc->config.lc3plus_frame_duration_us / 1000 );
     pBits->isar_frame_size_ms = (int16_t) ( hSplitBin->hLc3plusEnc->config.isar_frame_duration_us / 1000 );
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    pBits->lc3plus_highres = hSplitBin->hLc3plusEnc->config.high_res_mode_enabled;
+#endif
 
     return IVAS_ERR_OK;
 }
diff --git a/lib_rend/lib_rend.c b/lib_rend/lib_rend.c
index ceff2a2fd06d01393202d45d7a06366bbae45154..96afdaa79fe9aab2e62f1e172f6ecbca13af8bc8 100644
--- a/lib_rend/lib_rend.c
+++ b/lib_rend/lib_rend.c
@@ -8224,7 +8224,12 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     ISAR_SPLIT_REND_CODEC *pCodec,                        /* o  : pointer to codec setting                */
     ISAR_SPLIT_REND_POSE_CORRECTION_MODE *poseCorrection, /* o  : pointer to pose correction mode         */
     int16_t *pCodec_frame_size_ms,                        /* o  : pointer to codec frame size setting     */
-    int16_t *pIsar_frame_size_ms                          /* o  : pointer to ISAR frame size setting      */
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    int16_t *pIsar_frame_size_ms, /* o  : pointer to ISAR frame size setting      */
+    int16_t *pLc3plusHighRes      /* o  : pointer to LC3plus High-Res setting     */
+#else
+    int16_t *pIsar_frame_size_ms /* o  : pointer to ISAR frame size setting      */
+#endif
 )
 {
     if ( hIvasRend == NULL || hIvasRend->hRendererConfig == NULL )
@@ -8236,6 +8241,9 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     *pCodec_frame_size_ms = hIvasRend->hRendererConfig->split_rend_config.codec_frame_size_ms;
     *pIsar_frame_size_ms = hIvasRend->hRendererConfig->split_rend_config.isar_frame_size_ms;
     *poseCorrection = hIvasRend->hRendererConfig->split_rend_config.poseCorrectionMode;
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    *pLc3plusHighRes = hIvasRend->hRendererConfig->split_rend_config.lc3plus_highres;
+#endif
 
     return IVAS_ERR_OK;
 }
diff --git a/lib_rend/lib_rend.h b/lib_rend/lib_rend.h
index dfed1573148a1366a87db8cfdd2a372dab54bf29..c4faf090ea362dbf3b40be7d938a31eca54cf29b 100644
--- a/lib_rend/lib_rend.h
+++ b/lib_rend/lib_rend.h
@@ -297,7 +297,12 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     ISAR_SPLIT_REND_CODEC *pCodec,                  /* o  : pointer to codec setting                            */
     ISAR_SPLIT_REND_POSE_CORRECTION_MODE *poseCorrection, /* o  : pointer to pose correction mode               */
     int16_t *pCodec_frame_size_ms,                  /* o  : pointer to codec frame size setting                 */
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    int16_t *pIsar_frame_size_ms,                   /* o  : pointer to ISAR frame size setting                  */
+    int16_t *pLc3plusHighRes                        /* o  : pointer to LC3plus High-Res setting                 */
+#else
     int16_t *pIsar_frame_size_ms                    /* o  : pointer to ISAR frame size setting                  */
+#endif
 );
 
 ivas_error IVAS_REND_SetHeadRotation(