diff --git a/lib_com/options.h b/lib_com/options.h
index 1f09b730806f3a4d858dfc432657f623e79f3192..7aa9f1c91547b45b18620de0c0715d221efc4f31 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -210,6 +210,7 @@
 
 #define FIX_1430_EVS_STEREO_DMX_CHANNEL_DISAPPEARING    /* Orange: Fix for basop issue 2184 - to prevent one channel from becoming inaudible in the mono downmix output */
 #define FIX_1440_AMR_WB_RESET                           /* VA: issue 1440: Fix missing AMR-WB IO memory reset (applicable to float only) */
+#define FIX_BASOP_ISSUE_1585_CUT_BS_CRASH               /* FhG: Fix for BASOP issue 1585 crash of a cut bitstream, also valid for float code*/
 
 #define NONBE_FIX_BASOP_2233_RTPDUMP_DIFFERING_BITSTREAMS /* Nokia: fix basop issue 2233: Fix differing rtpdump streams */
 
diff --git a/lib_dec/core_switching_dec.c b/lib_dec/core_switching_dec.c
index 6445970f2a9309bce07356f9ef270e1d315b7668..f9ba20e70774938fafbd72e840c7f3a11706b7e1 100644
--- a/lib_dec/core_switching_dec.c
+++ b/lib_dec/core_switching_dec.c
@@ -663,7 +663,7 @@ ivas_error core_switching_post_dec(
             }
             else if ( ( ( st->last_core == ACELP_CORE || st->last_core_bfi == ACELP_CORE ) && !( st->prev_bfi == 1 && st->last_con_tcx == 1 ) ) || st->last_core == AMR_WB_CORE ) /*ACELP->TCX/HQ*/
             {
-                /* if this is first active MDCT-Stereo frame after a CNG frame and output format is mono DMX, this should only be done for the zero-th channel, the other one will simply be copied over after this function */
+                /* if output format is mono DMX, this should only be done for the zero-th channel, the other one will simply be copied over after this function */
                 if ( ( ( st->last_core_brate != SID_2k40 && st->last_core_brate != FRAME_NO_DATA ) || ( st->element_mode != IVAS_CPE_DFT && st->element_mode != IVAS_CPE_TD ) || nchan_out == 1 ) && !( st->element_mode == IVAS_CPE_MDCT && st->idchan == 1 && ( nchan_out == 1 || last_element_mode == IVAS_CPE_DFT ) ) )
                 {
                     core_switch_lb_upsamp( st, output );
diff --git a/lib_dec/ivas_mdct_core_dec.c b/lib_dec/ivas_mdct_core_dec.c
index 9cf401aba420831ffb4701c627136ca1345cb345..83e69cc96b10ae097cd93e38ad1ccce34c37d067 100644
--- a/lib_dec/ivas_mdct_core_dec.c
+++ b/lib_dec/ivas_mdct_core_dec.c
@@ -160,6 +160,13 @@ static void dec_prm_tcx_sidebits(
         st->last_core_from_bs = st->last_core;
     }
 
+#ifdef FIX_BASOP_ISSUE_1585_CUT_BS_CRASH
+    /* for first frame reset last_core to initialization value for better error-robustness*/
+    if ( st->ini_frame == 0 )
+    {
+        st->last_core = TCX_20_CORE;
+    }
+#endif
     getTCXWindowing( st->core, st->last_core, st->element_mode, st->hTcxCfg, st0 );
 
     st->hTcxDec->kernel_type[0] = st->hTcxDec->kernel_type[1] = MDCT_IV;