Accessing non-existing variable (NULL handle)

with 0c11047f and the following bitstream,

sp-noi.aunclr.file21_-stereo_-dtx_32000_32.bit

the decoder tries to access a variable declared in a state that is not allocated. The problem happens in the function stereo_switching_dec() around Ln4018, when the variable prevTargetGain_fx is access from an none allocated state (hStereoDftDmx is NULL)

                IF( hCPE->hStereoDftDmx->prevTargetGain_fx == ONE_IN_Q29 )
                {
                    tmpF_fx = ONE_IN_Q27;
                }
                ELSE
                {
                    Word16 temp_b = (Word16) L_shr( hCPE->hStereoDftDmx->prevTargetGain_fx, 16 );
                    Word16 temp_b_q = 2;
                    tmpF_fx = Inv16( temp_b, &temp_b_q );
                    tmpF_fx = L_shl( tmpF_fx, ( 31 - 4 ) - ( 15 - temp_b_q ) );
                }