diff --git a/lib_com/options.h b/lib_com/options.h
index 0a966bc252c7252d2a4507c4d4393f63e2ef3c3e..7b225f6557466ad04fcea056ba8b10d31bac47a3 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -153,8 +153,8 @@
 #define FIX_383_CLEAN_UP                                /* Dlb : Clean up of unused functions */
 // #define FIX_532_ISM_MD_INACTIVE                         /* VA: issue 532: improve MD coding in ISM inactive frames */
 #define FIX_547_NAN_IGF_DEC                             /* FhG: issue 547: fix possible nan in IGF decoder */
-
 #define FIX_529_BWD_ISSUE                               /* VA: issue 529: fix Bandwidth Detector not working reliably for Music and Generic Audio */
+#define FIX_557_CRASH_IN_ISM_DTX                        /* VA issue 557: fix crash in 1ISM 48 kbps DTX */
 
 #define IGF_TUNING_96                                   /* FhG: Issue 546: slight tuning of IGF config used in 96 kbps stereo, 128 kbps SBA and others */
 
diff --git a/lib_enc/ivas_core_pre_proc.c b/lib_enc/ivas_core_pre_proc.c
index 1e536f802668c85ff16f6964fcbe3dc294a7405c..9c4942314d6eab281c3032e769f512aa470209e4 100644
--- a/lib_enc/ivas_core_pre_proc.c
+++ b/lib_enc/ivas_core_pre_proc.c
@@ -129,7 +129,11 @@ ivas_error pre_proc_ivas(
     {
         st->L_frame = L_FRAME32k;
     }
+#ifdef FIX_557_CRASH_IN_ISM_DTX
+    else if ( st->bwidth >= SWB && st->total_brate > MAX_ACELP_BRATE_ISM && st->total_brate <= MAX_ACELP_BRATE && element_mode == IVAS_SCE && st->is_ism_format && st->tcxonly && st->core_brate != SID_2k40 )
+#else
     else if ( st->bwidth >= SWB && st->total_brate > MAX_ACELP_BRATE_ISM && st->total_brate <= MAX_ACELP_BRATE && element_mode == IVAS_SCE && st->is_ism_format && st->tcxonly )
+#endif
     {
         st->L_frame = L_FRAME25_6k;
     }