From 430047078610015b35243df534b4bb88d425f826 Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <jgbt@protonmail.com>
Date: Tue, 15 Nov 2022 18:10:51 -0500
Subject: [PATCH] Fix for empty tsdb query result case

---
 piker/data/feed.py | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/piker/data/feed.py b/piker/data/feed.py
index 93630a13..f291c512 100644
--- a/piker/data/feed.py
+++ b/piker/data/feed.py
@@ -690,14 +690,13 @@ async def tsdb_backfill(
                     timeframe=timeframe,
                 )
 
+                # empty query
+                if not len(tsdb_history):
+                    break
+
                 next_start = tsdb_history['Epoch'][0]
-                if (
-                    not len(tsdb_history)  # empty query
-
+                if next_start >= tsdb_last_frame_start:
                     # no earlier data detected
-                    or next_start >= tsdb_last_frame_start
-
-                ):
                     break
                 else:
                     tsdb_last_frame_start = next_start