diff --git a/lib_com/options.h b/lib_com/options.h
index fe6c9fe2df75ec12b4d734615d5e92dcfefcaaf9..06332990eb995dc062cd531a7f8442d0f68a86a4 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -158,7 +158,8 @@
 
 #define DFT_STEREO_SPAR_MIXING
 #ifdef DFT_STEREO_SPAR_MIXING
-#define FIX_345_MSAN_ERROR                           /* FhG. Fix memory sanitizer error in PLC modes */
+#define FIX_345_MSAN_ERROR                           /* FhG: Fix memory sanitizer error in PLC modes */
+#define FIX_347_DTX_CRASH                            /* FhG: Fix crash that can happen with DTX */
 /*#define DFT_STEREO_SPAR_MIXING_DEBUG*/             /* more debugging output for DFT_STEREO_SPAR_MIXING_DEBUG */
 #define DISABLE_RES_CHANNELS_MCT                     /* decode only W and residual for Y when outputting to stereo */
 #endif
diff --git a/lib_dec/ivas_core_dec.c b/lib_dec/ivas_core_dec.c
old mode 100644
new mode 100755
index ccc752fdc5f7f51877051799bd873879dbecdbee..be6f38d4581091b690f9d91ea1dc8fa4946e31d1
--- a/lib_dec/ivas_core_dec.c
+++ b/lib_dec/ivas_core_dec.c
@@ -240,7 +240,11 @@ ivas_error ivas_core_dec(
         hCPE->hStereoCng->flag_cna_fade = 0;
     }
 
+#ifdef FIX_347_DTX_CRASH
+    if ( sba_dirac_stereo_flag && hSCE && sts[0]->total_brate <= SID_2k40 && sts[0]->cng_type == FD_CNG )
+#else
     if ( sba_dirac_stereo_flag && sts[0]->total_brate <= SID_2k40 && sts[0]->cng_type == FD_CNG )
+#endif
     {
         save_hb_synth = hSCE->save_hb_synth;
     }
@@ -461,7 +465,11 @@ ivas_error ivas_core_dec(
 
 
         /* for FD-CNG we need the delay compensation in the synth, so do this afterwards */
+#ifdef FIX_347_DTX_CRASH
+        if ( sba_dirac_stereo_flag && hSCE && st->core_brate == SID_2k40 && st->cng_type == FD_CNG )
+#else
         if ( sba_dirac_stereo_flag && st->core_brate == SID_2k40 && st->cng_type == FD_CNG )
+#endif
         {
             mvr2r( synth[n], hSCE->save_synth, output_frame );
         }