1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib_table.c b/src/lib_table.c
index 63a6a4c6..0214bb40 100644
--- a/src/lib_table.c
+++ b/src/lib_table.c
@@ -159,7 +159,7 @@ LJLIB_CF(table_concat)		LJLIB_REC(.)
   SBuf *sb = lj_buf_tmp_(L);
   SBuf *sbx = lj_buf_puttab(sb, t, sep, i, e);
   if (LJ_UNLIKELY(!sbx)) {  /* Error: bad element type. */
-    int32_t idx = (int32_t)(intptr_t)sbufP(sb);
+    int32_t idx = (int32_t)(intptr_t)sb->w;
     cTValue *o = lj_tab_getint(t, idx);
     lj_err_callerv(L, LJ_ERR_TABCAT,
                    lj_obj_itypename[o ? itypemap(o) : ~LJ_TNIL], idx);