diff --git a/cpdctrl_gui/ui/widgets/plot.py b/cpdctrl_gui/ui/widgets/plot.py
index 075299f..26b6369 100644
--- a/cpdctrl_gui/ui/widgets/plot.py
+++ b/cpdctrl_gui/ui/widgets/plot.py
@@ -2,6 +2,10 @@ import numpy as np
 import pyqtgraph as pg
 from PyQt6.QtWidgets import QWidget
 
+
+import logging
+log = logging.getLogger(__name__)
+
 class Plot(pg.GraphicsLayoutWidget):
     """
     pyqtgraph plot widget for showing voltage and LED vs time
@@ -44,12 +48,12 @@ class Plot(pg.GraphicsLayoutWidget):
         # self.getAxis("right").setRange(0, 110)  # Adding some margin
         # self.showGrid(x=True, y=True)
         self.MAX_DATA_POINTS = max_data_points
-        self.data_t = np.empty(self.MAX_DATA_POINTS, dtype=float)
-        self.data_v = np.empty(self.MAX_DATA_POINTS, dtype=float)
-        self.data_l = np.empty(self.MAX_DATA_POINTS, dtype=float)
-        self.n_data_array = 0
-        self.n_data_total = 0
-        self.n_data_skip = 0
+        self.data_t = None
+        self.data_v = None
+        self.data_l = None
+        self.n_data_array = None
+        self.n_data_total = None
+        self.n_data_take_every_nth = None
 
         self.v_line = pg.PlotCurveItem(
             [],
@@ -66,6 +70,9 @@ class Plot(pg.GraphicsLayoutWidget):
         )
         self.l_box.addItem(self.l_line)
         self.v_box.addItem(self.v_line)
+
+        self.clear_data()
+
         self.update_views()
         self.v_plot_item.getViewBox().sigResized.connect(self.update_views)
 
@@ -90,14 +97,16 @@ class Plot(pg.GraphicsLayoutWidget):
         # if the array is full, keep only every second data point
         # and skip every second data point.
         if self.n_data_array == self.MAX_DATA_POINTS:
+            log.debug(f"Reached {self.MAX_DATA_POINTS} data points, taking only 1/{self.n_data_take_every_nth+1} data points from now on")
             for i in range(0, self.MAX_DATA_POINTS//2):
                 self.data_t[i] = self.data_t[2 * i]
                 self.data_v[i] = self.data_v[2 * i]
                 self.data_l[i] = self.data_l[2 * i]
             self.n_data_array = self.MAX_DATA_POINTS//2
-            self.n_data_skip += 1
+            self.n_data_take_every_nth += 1
+
         # skip data points to keep a constant interval
-        if self.n_data_skip == 0 or self.n_data_total % self.n_data_skip == 0:
+        if self.n_data_total % self.n_data_take_every_nth == 0:
             self.data_t[self.n_data_array] = time
             self.data_v[self.n_data_array] = voltage
             self.data_l[self.n_data_array] = led
@@ -117,6 +126,6 @@ class Plot(pg.GraphicsLayoutWidget):
         self.data_l = np.empty(self.MAX_DATA_POINTS, dtype=float)
         self.n_data_array = 0
         self.n_data_total = 0
-        self.n_data_skip = 0
+        self.n_data_take_every_nth = 1
         self.v_line.setData([], [])
         self.l_line.setData([], [])