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-rw-r--r--src/nvim/window.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/window.c b/src/nvim/window.c
index a34daccb89..db6c0f9048 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -3167,6 +3167,7 @@ void close_tabpage(tabpage_T *tab)
ptp = ptp->tp_next) {
// do nothing
}
+ assert(ptp != NULL);
ptp->tp_next = tab->tp_next;
}