Add an Assert.

diff --git a/src/backend/utils/mmgr/freepage.c b/src/backend/utils/mmgr/freepage.c
index 0361aa4fb5e56a054efa8dffd596fd92b3be6f06..0fdd758752f7698eb3e9586a7191ffdaea8cd2f3 100644 (file)
--- a/src/backend/utils/mmgr/freepage.c
+++ b/src/backend/utils/mmgr/freepage.c
@@ -1378,6 +1378,7 @@ FreePageManagerPutInternal(FreePageManager *fpm, Size first_page, Size npages,
        FreePageBtreeLeafKey *nextkey = NULL;
        FreePageBtree *np;
        Size    nindex;
+       Assert(npages > 0);
 
        /* We can store a single free span without initializing the btree. */
        if (fpm->btree_depth == 0)