Apparatus for decoding an encoded audio signal comprising an encoded core signal and parametric data, comprising: a core decoder for decoding the encoded core signal to obtain a decoded core signal; an analyzer (602, 614, 704, 720) for analyzing the decoded core signal or a preliminary regenerated signal obtained by performing a preliminary frequency regeneration procedure (702, 718) to provide an analysis result; and a frequency regenerator for regenerating spectral portions not included in the decoded core signal using one or more spectral portions of the decoded core signal, the parametric data, and the analysis result, wherein the analyzer is configured for detecting a splitting of a peak spectral portion in the one or more spectral portions of the decoded core signal or in the preliminary regenerated signal at a frequency border of the decoded core signal or at a frequency border between two regenerated spectral portions in the preliminary regenerated signal generated by using the same or different spectral portions of the decoded core signal or at a maximum frequency border of the preliminary regenerated signal, wherein the frequency regenerator is configured to perform the preliminary regeneration procedure (702, 718), wherein the frequency regenerator is configured for changing (706, 722) the frequency border between the decoded core signal and the preliminary regenerated signal or for changing the frequency border between the two regenerated spectral portions in the preliminary regenerated signal or for changing the maximum frequency border, and wherein the frequency regenerator is configured for performing a reconstruction with the changed frequency border between the decoded core signal and the preliminary regenerated signal or with the changed frequency border between the two regenerated spectral portions in the preliminary regenerated signal or with the changed maximum frequency border, so that the splitting is reduced or eliminated. a core decoder for decoding the encoded core signal to obtain a decoded core signal; an analyzer (602, 614, 704, 720) for analyzing the decoded core signal or a preliminary regenerated signal obtained by performing a preliminary frequency regeneration procedure (702, 718) to provide an analysis result; and a frequency regenerator for regenerating spectral portions not included in the decoded core signal using one or more spectral portions of the decoded core signal, the parametric data, and the analysis result, wherein the analyzer is configured for detecting a splitting of a peak spectral portion in the one or more spectral portions of the decoded core signal or in the preliminary regenerated signal at a frequency border of the decoded core signal or at a frequency border between two regenerated spectral portions in the preliminary regenerated signal generated by using the same or different spectral portions of the decoded core signal or at a maximum frequency border of the preliminary regenerated signal, wherein the frequency regenerator is configured to perform the preliminary regeneration procedure (702, 718), wherein the frequency regenerator is configured for changing (706, 722) the frequency border between the decoded core signal and the preliminary regenerated signal or for changing the frequency border between the two regenerated spectral portions in the preliminary regenerated signal or for changing the maximum frequency border, and wherein the frequency regenerator is configured for performing a reconstruction with the changed frequency border between the decoded core signal and the preliminary regenerated signal or with the changed frequency border between the two regenerated spectral portions in the preliminary regenerated signal or with the changed maximum frequency border, so that the splitting is reduced or eliminated.