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-rw-r--r--src/fe-common/core/window-items.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/fe-common/core/window-items.c b/src/fe-common/core/window-items.c
index 649241fb..0c81c282 100644
--- a/src/fe-common/core/window-items.c
+++ b/src/fe-common/core/window-items.c
@@ -35,6 +35,7 @@ void window_item_add(WINDOW_REC *window, WI_ITEM_REC *item, int automatic)
{
g_return_if_fail(window != NULL);
g_return_if_fail(item != NULL);
+ g_return_if_fail(item->window == NULL);
item->window = window;