diff --git a/lib_com/options.h b/lib_com/options.h
index 3022909a35ae61f8ac37c70f8e8a4646134edd9d..a106710c88ef5f4dea8da12887d31b0a2bf292a8 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -104,6 +104,7 @@
 #define FIX_2489_HARMONIZE_FdCng_encodeSID              /* FhG: harmonize FdCng_encodeSID_fx() and FdCng_encodeSID_ivas_fx()  */
 #define FIX_1527_CMR_BITRATE_IDX                        /* Fix for incorrect bitrate idx packed in rtp CMR E-byte */
 #define HARMONIZE_2494_FdCng_decodeSID_fx               /* FhG: harmonize FdCng_decodeSID_fx with _ivas_ version */
+#define FIX_BASOP_2509_EVS_CONCEAL_UNINIT_MEM           /* FhG: BASOP 2509: st->hTcxCfg->psychParamsCurrent is not initialized */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_com/prot_fx.h b/lib_com/prot_fx.h
index 21035960d97191217a2cc5cd19087a779e3a4b78..5eb6bc7e9ec79bbf2674c12483cd3525cd688aa7 100644
--- a/lib_com/prot_fx.h
+++ b/lib_com/prot_fx.h
@@ -7295,7 +7295,12 @@ ivas_error ppp_quarter_decoder_fx(
 void open_decoder_LPD_fx(
     Decoder_State *st,
     const Word32 total_brate, /* Q0 */
-    const Word16 bwidth       /* Q0 */
+#ifndef FIX_BASOP_2509_EVS_CONCEAL_UNINIT_MEM
+    const Word16 bwidth /* Q0 */
+#else
+    const Word16 bwidth, /* Q0 */
+    const Word16 is_init /* i  : indicate call during initialization    */
+#endif
 );
 
 void open_decoder_LPD_ivas_fx(
diff --git a/lib_dec/core_dec_init_fx.c b/lib_dec/core_dec_init_fx.c
index dd3115fb709f0b1bcbdffa12ccfacdde208e166c..357a57f0b888d233890ba3ae2fc98ab8272fa635 100644
--- a/lib_dec/core_dec_init_fx.c
+++ b/lib_dec/core_dec_init_fx.c
@@ -20,7 +20,12 @@
 void open_decoder_LPD_fx(
     Decoder_State *st,
     const Word32 total_brate, /* Q0 */
-    const Word16 bwidth       /* Q0 */
+#ifndef FIX_BASOP_2509_EVS_CONCEAL_UNINIT_MEM
+    const Word16 bwidth /* Q0 */
+#else
+    const Word16 bwidth, /* Q0 */
+    const Word16 is_init /* i  : indicate call during initialization    */
+#endif
 )
 {
     Word16 i;
@@ -206,6 +211,29 @@ void open_decoder_LPD_fx(
         set16_fx( hBWE_TD->cur_sub_Aq_fx, 0, M + 1 ); /* Q12 */
     }
 
+#ifdef FIX_BASOP_2509_EVS_CONCEAL_UNINIT_MEM
+    IF( st->hIGFDec != NULL )
+    {
+        test();
+        IF( !is_init || NE_16( st->element_mode, IVAS_CPE_MDCT ) )
+        {
+            init_tcx_cfg_fx( st->hTcxCfg, total_brate, st->sr_core, st->output_Fs, st->L_frame, st->bwidth, st->hTcxDec->L_frameTCX, st->fscale, st->preemph_fac, st->tcxonly, st->rf_flag, st->igf, st->hIGFDec->infoIGFStopFreq, st->element_mode, st->ini_frame, MCT_flag, fscaleFB );
+        }
+        ELSE
+        {
+            st->hTcxCfg->tcx_curr_overlap_mode = st->hTcxCfg->tcx_last_overlap_mode = ALDO_WINDOW;
+            move16();
+            move16();
+            st->hTcxCfg->last_aldo = 1;
+            move16();
+        }
+    }
+
+    IF( st->hTECDec != NULL )
+    {
+        resetTecDec_Fx( st->hTECDec );
+    }
+#else
     /*TCX config*/
     st->hTcxCfg->preemph_fac = st->preemph_fac;
     move16();
@@ -269,6 +297,7 @@ void open_decoder_LPD_fx(
 
     /* Initialize decoder delay */
 
+#endif
 
     if ( NE_16( st->element_mode, IVAS_SCE ) )
     {
diff --git a/lib_dec/core_dec_switch_fx.c b/lib_dec/core_dec_switch_fx.c
index 142609fff4505ab659dc70912ef87ecd305fabeb..ea55dd251049f3449dcb7b9a9acd62c1a5697588 100644
--- a/lib_dec/core_dec_switch_fx.c
+++ b/lib_dec/core_dec_switch_fx.c
@@ -89,7 +89,11 @@ void mode_switch_decoder_LPD_fx(
     test();
     IF( NE_16( fscale, st->fscale ) || ( switchWB != 0 ) || ( bSwitchFromAmrwbIO != 0 ) || EQ_16( st->last_codec_mode, MODE1 ) || st->force_lpd_reset )
     {
+#ifdef FIX_BASOP_2509_EVS_CONCEAL_UNINIT_MEM
+        open_decoder_LPD_fx( st, total_brate, bwidth, 0 );
+#else
         open_decoder_LPD_fx( st, total_brate, bwidth );
+#endif
     }
     ELSE
     {
diff --git a/lib_dec/init_dec_fx.c b/lib_dec/init_dec_fx.c
index bae2638e15c67d5ccb26102b92b4f527bc961233..d3b61ab39baff869796c8d7f61dfeb4c02cfd497 100644
--- a/lib_dec/init_dec_fx.c
+++ b/lib_dec/init_dec_fx.c
@@ -881,7 +881,11 @@ ivas_error init_decoder_fx(
     /* Init Decoder */
     IF( st_fx->element_mode == EVS_MONO )
     {
+#ifdef FIX_BASOP_2509_EVS_CONCEAL_UNINIT_MEM
+        open_decoder_LPD_fx( st_fx, st_fx->total_brate, st_fx->bwidth, 1 );
+#else
         open_decoder_LPD_fx( st_fx, st_fx->total_brate, st_fx->bwidth );
+#endif
     }
     ELSE
     {