Only use last `ChartView._yrange` if set

2023-02-09 09:21:04 -05:00 · 2023-02-09 09:21:04 -05:00 · d742dd25c9
parent 2b075c7644
commit d742dd25c9
1 changed files with 6 additions and 1 deletions
--- a/piker/ui/_display.py
+++ b/piker/ui/_display.py
@ -554,7 +554,12 @@ def graphics_update_cycle(
    main_vb: ChartView = main_viz.plot.vb
    this_viz: Viz = chart._vizs[fqsn]
    this_vb: ChartView = this_viz.plot.vb
-    lmn, lmx = this_vb._yrange
+    this_yr = this_vb._yrange
+    if this_yr:
+        lmn, lmx = this_yr
+    else:
+        lmn = lmx = 0
+
    mx: float = lmx
    mn: float = lmn
    mx_vlm_in_view: float | None = None