diff --git a/src/gausskernel/storage/access/nbtree/nbtsearch.cpp b/src/gausskernel/storage/access/nbtree/nbtsearch.cpp
index 24bdcf8b809e78df83c6bf64b97331875ddd86db..8d76bde79df3a857f9d47fc189e14e0c9bf5c767 100644
--- a/src/gausskernel/storage/access/nbtree/nbtsearch.cpp
+++ b/src/gausskernel/storage/access/nbtree/nbtsearch.cpp
@@ -1398,7 +1398,9 @@ static bool _bt_steppage(IndexScanDesc scan, ScanDirection dir)
             }
 
             /* Step to next physical page */
-            so->currPos.buf = _bt_walk_left(rel, so->currPos.buf);
+			Buffer temp = so->currPos.buf;
+			so->currPos.buf = InvalidBuffer;
+            so->currPos.buf = _bt_walk_left(rel, temp);
 
             /* if we're physically at end of index, return failure */
             if (so->currPos.buf == InvalidBuffer)