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-rw-r--r--src/manage.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/manage.c b/src/manage.c
index b11dc4a..c30b242 100644
--- a/src/manage.c
+++ b/src/manage.c
@@ -877,6 +877,9 @@ withdraw_window (rp_window *win)
/* Give back the window number. the window will get another one,
if it is remapped. */
+ if (win->number == -1)
+ PRINT_ERROR(("Attempting to withdraw '%s' with number -1!\n", window_name(win)));
+
numset_release (rp_window_numset, win->number);
win->number = -1;