diff --git a/chem_spectra/lib/composer/ni.py b/chem_spectra/lib/composer/ni.py
index 9b3ebf0f..2e16a1cd 100644
--- a/chem_spectra/lib/composer/ni.py
+++ b/chem_spectra/lib/composer/ni.py
@@ -155,7 +155,11 @@ def __gen_cyclic_voltammetry_data_peaks(self):
                 y_pecker = self.core.ys[idx]
 
             for peak in listMaxMinPeaks:
-                max_peak, min_peak = peak['max'], peak['min']
+                max_peak, min_peak = None, None
+                if 'max' in peak:
+                    max_peak = peak['max']
+                if 'min' in peak:
+                    min_peak = peak['min']
                 x_max_peak, y_max_peak = self.__get_xy_of_peak(max_peak)
                 x_min_peak, y_min_peak = self.__get_xy_of_peak(min_peak)
 
@@ -302,7 +306,11 @@ def tf_img(self):
                 listMaxMinPeaks = self.core.params['list_max_min_peaks']
 
             for peak in listMaxMinPeaks:
-                max_peak, min_peak = peak['max'], peak['min']
+                max_peak, min_peak = None, None
+                if 'max' in peak:
+                    max_peak = peak['max']
+                if 'min' in peak:
+                    min_peak = peak['min']
                 x_max_peak, y_max_peak = self.__get_xy_of_peak(max_peak)
                 x_min_peak, y_min_peak = self.__get_xy_of_peak(min_peak)
 
@@ -529,7 +537,11 @@ def tf_csv(self):
                 y_pecker = self.core.ys[idx]
 
             for peak in listMaxMinPeaks:
-                max_peak, min_peak = peak['max'], peak['min']
+                max_peak, min_peak = None, None
+                if 'max' in peak:
+                    max_peak = peak['max']
+                if 'min' in peak:
+                    min_peak = peak['min']
                 x_max_peak, y_max_peak = self.__get_xy_of_peak(max_peak)
                 x_min_peak, y_min_peak = self.__get_xy_of_peak(min_peak)