waveform: fix log msg display

2024-02-26 13:01:16 +08:00 · 2024-02-26 13:01:16 +08:00 · c794e51c1c
parent bafa69098a
commit c794e51c1c
1 changed files with 5 additions and 3 deletions
--- a/artiq/dashboard/waveform.py
+++ b/artiq/dashboard/waveform.py
@ -371,9 +371,11 @@ class LogWaveform(_BaseWaveform):
            self._labels = []
            self.plot_data_item.setData(
                x=self.x_data, y=np.ones(len(self.x_data)))
-            old_msg = ""
-            old_x = 0
-            for x, msg in data:
+            if len(data) == 0:
+                return
+            old_x = data[0][0]
+            old_msg = data[0][1]
+            for x, msg in data[1:]:
                if x == old_x:
                    old_msg += "\n" + msg
                else: