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-rw-r--r--test/functional/ui/screen.lua1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/functional/ui/screen.lua b/test/functional/ui/screen.lua
index 83424d3bea..2307fd106b 100644
--- a/test/functional/ui/screen.lua
+++ b/test/functional/ui/screen.lua
@@ -947,6 +947,7 @@ end
function Screen:_handle_grid_line(grid, row, col, items)
assert(self._options.ext_linegrid)
+ assert(#items > 0)
local line = self._grids[grid].rows[row+1]
local colpos = col+1
local hl_id = 0