diff --git a/lib_com/options.h b/lib_com/options.h
index f81f82b1635780ea3482c33f53e9d7e605598337..1e44c32497a747098ea431b6d2d7e3a0e1f819aa 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -211,6 +211,7 @@
 #define NONBE_FIX_738_SBA_BR_SW_ASAN                          /* FhG: issue 738: fixes bug when switching to an MCT bitrate and previous frame was ACELP */
 #define NONBE_CR_FIX_735_SBA_HP20_BRATE_SWITCHING             /* VA: Issue 735: Resolve "HP20 filtering bug in SBA/OSBA bitrate switching" */
 #define NONBE_FIX_588_UPDATE_FASTCONV_SD                      /* FhG: issue 588: update FastConv SD HRTFs in CLDFB domain with new conversion method */
+#define NONBE_FIX_774_OSBA_MONO_DEC_CRASH                     /* FhG: issue 774: decoder crash for OSBA to mono */
 #define NONBE_FIX_802_PARAMUPMIX_HIGHPASS                     /* Dlb: issue 802: Move HighPass filter operation for ParamUpmix */
 #define NONBE_FIX_778_TNS_UNFIED_STEREO_MSAN                  /* FhG: Issue 778: MSAN error due to uninitialized TNS configuration */
 #define NONBE_FIX_797_OMASA_INACTIVE_SEP_OBJ                 /* VA: issue 797:  fix of crash when the separated object is inactive and the MASA metadata is using very few bits */
diff --git a/lib_dec/ivas_mono_dmx_renderer.c b/lib_dec/ivas_mono_dmx_renderer.c
index 599bee9ff9d1414dda3b1e6e1c483332d7f77ea4..6dd42d3a5690617158cee12a5cc30f2944caafbc 100644
--- a/lib_dec/ivas_mono_dmx_renderer.c
+++ b/lib_dec/ivas_mono_dmx_renderer.c
@@ -68,9 +68,13 @@ ivas_error ivas_mono_dmx_renderer_open(
         return ( IVAS_ERROR( IVAS_ERR_FAILED_ALLOC, "Can not allocate memory for downmixing\n" ) );
     }
 
+#ifdef NONBE_FIX_774_OSBA_MONO_DEC_CRASH
+    hDownmix->inputEnergy = 0;
+    hDownmix->protoEnergy = 0;
+#else
     set_zero( hDownmix->inputEnergy, CLDFB_NO_CHANNELS_MAX );
     set_zero( hDownmix->protoEnergy, CLDFB_NO_CHANNELS_MAX );
-
+#endif
     st_ivas->hMonoDmxRenderer = hDownmix;
 
     return IVAS_ERR_OK;
@@ -121,19 +125,36 @@ void ivas_mono_downmix_render_passive(
     }
 
     /* compute the input energy, proto energy after smoothing */
+#ifdef NONBE_FIX_774_OSBA_MONO_DEC_CRASH
+    hDownmix->inputEnergy *= DOWNMIX_ALPHA;
+    hDownmix->protoEnergy *= DOWNMIX_ALPHA;
+#else
     hDownmix->inputEnergy[0] *= DOWNMIX_ALPHA;
     hDownmix->protoEnergy[0] *= DOWNMIX_ALPHA;
+#endif
     for ( i = 0; i < output_frame; i++ )
     {
+#ifdef NONBE_FIX_774_OSBA_MONO_DEC_CRASH
+        hDownmix->protoEnergy += proto_signal[i] * proto_signal[i];
+#else
         hDownmix->protoEnergy[0] += proto_signal[i] * proto_signal[i];
+#endif
         for ( j = 0; j < numInputChannels; j++ )
         {
+#ifdef NONBE_FIX_774_OSBA_MONO_DEC_CRASH
+            hDownmix->inputEnergy += ( output_f[j][i] * output_f[j][i] );
+#else
             hDownmix->inputEnergy[0] += ( output_f[j][i] * output_f[j][i] );
+#endif
         }
     }
 
     /* compute the eq factor */
+#ifdef NONBE_FIX_774_OSBA_MONO_DEC_CRASH
+    eq = min( DOWNMIX_MAX_GAIN, sqrtf( hDownmix->inputEnergy / ( EPSILON + hDownmix->protoEnergy ) ) );
+#else
     eq = min( DOWNMIX_MAX_GAIN, sqrtf( hDownmix->inputEnergy[0] / ( EPSILON + hDownmix->protoEnergy[0] ) ) );
+#endif
 
     /* equalize the downmix */
     v_multc( proto_signal, eq, output_f[0], output_frame );
diff --git a/lib_dec/ivas_sba_dec.c b/lib_dec/ivas_sba_dec.c
index 62b735f218856c01514e8cbd09b9bd944972232d..dcc2c023d8685e1f051720105ad052073b18a238 100755
--- a/lib_dec/ivas_sba_dec.c
+++ b/lib_dec/ivas_sba_dec.c
@@ -526,6 +526,27 @@ ivas_error ivas_sba_dec_reconfigure(
                 }
             }
 
+#ifdef NONBE_FIX_774_OSBA_MONO_DEC_CRASH
+            if ( st_ivas->renderer_type == RENDERER_MONO_DOWNMIX )
+            {
+                if ( st_ivas->hMonoDmxRenderer == NULL )
+                {
+                    if ( ( error = ivas_mono_dmx_renderer_open( st_ivas ) ) != IVAS_ERR_OK )
+                    {
+                        return error;
+                    }
+                }
+            }
+            else
+            {
+                if ( st_ivas->hMonoDmxRenderer != NULL )
+                {
+                    free( st_ivas->hMonoDmxRenderer );
+                    st_ivas->hMonoDmxRenderer = NULL;
+                }
+            }
+#endif
+
             if ( st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV )
             {
                 /* Allocate TD renderer for the objects in DISC mode */
diff --git a/lib_rend/ivas_stat_rend.h b/lib_rend/ivas_stat_rend.h
index 7cb19be7482736a07a917d259e35c8885691e53f..d1a19e6317192da4a56621ffe608ede7897601f5 100644
--- a/lib_rend/ivas_stat_rend.h
+++ b/lib_rend/ivas_stat_rend.h
@@ -1539,8 +1539,13 @@ typedef struct ivas_LS_setupconversion_mapping
 
 typedef struct ivas_mono_downmix_renderer_struct
 {
+#ifdef NONBE_FIX_774_OSBA_MONO_DEC_CRASH
+    float inputEnergy;
+    float protoEnergy;
+#else
     float inputEnergy[CLDFB_NO_CHANNELS_MAX];
     float protoEnergy[CLDFB_NO_CHANNELS_MAX];
+#endif
 
 } MONO_DOWNMIX_RENDERER_STRUCT, *MONO_DOWNMIX_RENDERER_HANDLE;