From 8fd139a9f306be0fe6b8c691491101e85e5ae69c Mon Sep 17 00:00:00 2001
From: Martin Chase <outofculture@gmail.com>
Date: Tue, 24 Sep 2024 10:40:48 -0700
Subject: [PATCH] do not attempt to merge when nothing is selected

---
 cellpose/gui/gui.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cellpose/gui/gui.py b/cellpose/gui/gui.py
index 4d92732a..1f72131e 100644
--- a/cellpose/gui/gui.py
+++ b/cellpose/gui/gui.py
@@ -1445,6 +1445,8 @@ def done_remove_multiple_cells(self):
             self.remove_roi(self.remove_roi_obj)
 
     def merge_cells(self, idx):
+        if self.selected == 0:
+            return
         self.prev_selected = self.selected
         self.selected = idx
         if self.selected != self.prev_selected: