diff --git a/pyrelacs/ui/plots/continously.py b/pyrelacs/ui/plots/continously.py
index 297591d..ece2ca2 100644
--- a/pyrelacs/ui/plots/continously.py
+++ b/pyrelacs/ui/plots/continously.py
@@ -16,6 +16,7 @@ class Continously:
         self.figure = figure
         self.buffer = buffer
         self.last_plotted_index = 0
+        self.timer = QTimer()
 
     def plot(self, *args, **kwargs):
         self.figure.setBackground("w")
@@ -36,7 +37,6 @@ class Continously:
         )
 
         # self.plot_index = 0
-        self.timer = QTimer()
         self.CHUNK_PLOT = int(self.buffer.samplerate / 6)
         self.PLOT_HISTORY = 500_000  # The amount of data you want to keep on screen
         self.timer.setInterval(150)
@@ -70,18 +70,19 @@ class Continously:
 
     def stop_plotting(self):
         self.timer.stop()
-        total_count = self.buffer.totalcount()
-        times, items = self.buffer.read(
-            self.last_plotted_index,
-            extend=total_count - self.last_plotted_index,
-        )
-        self.time = np.concatenate((self.time, times))[-self.PLOT_HISTORY :]
-        self.data = np.concatenate((self.data, items))[-self.PLOT_HISTORY :]
-        self.line.setData(
-            self.time,
-            self.data,
-        )
-        self.last_plotted_index += total_count - self.last_plotted_index
+        if self.last_plotted_index > 0:
+            total_count = self.buffer.totalcount()
+            times, items = self.buffer.read(
+                self.last_plotted_index,
+                extend=total_count - self.last_plotted_index,
+            )
+            self.time = np.concatenate((self.time, times))[-self.PLOT_HISTORY :]
+            self.data = np.concatenate((self.data, items))[-self.PLOT_HISTORY :]
+            self.line.setData(
+                self.time,
+                self.data,
+            )
+            self.last_plotted_index += total_count - self.last_plotted_index
 
     def refresh(self):
         self.continous_ax.enableAutoRange()