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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 e8b067d46c..24fe529fd6 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -1300,6 +1300,7 @@ static void win_rotate(int upwards, int count)
if (upwards) { /* first window becomes last window */
/* remove first window/frame from the list */
frp = curwin->w_frame->fr_parent->fr_child;
+ assert(frp != NULL);
wp1 = frp->fr_win;
win_remove(wp1, NULL);
frame_remove(frp);