diff --git a/src/lj_ffrecord.c b/src/lj_ffrecord.c
index b298d3f7..938c23b6 100644
--- a/src/lj_ffrecord.c
+++ b/src/lj_ffrecord.c
@@ -259,7 +259,7 @@ static void LJ_FASTCALL recff_setmetatable(jit_State *J, RecordFFData *rd)
     mtref = tref_isnil(mt) ? lj_ir_knull(J, IRT_TAB) : mt;
     emitir(IRT(IR_FSTORE, IRT_TAB), fref, mtref);
     if (!tref_isnil(mt))
-      emitir(IRT(IR_TBAR, IRT_TAB), tr, 0);
+      emitir(IRT(IR_TBAR, IRT_NIL), tr, 0);
     J->base[0] = tr;
     J->needsnap = 1;
   }  /* else: Interpreter will throw. */
diff --git a/src/lj_opt_narrow.c b/src/lj_opt_narrow.c
index 1172df2b..02fb9e68 100644
--- a/src/lj_opt_narrow.c
+++ b/src/lj_opt_narrow.c
@@ -341,7 +341,8 @@ static int narrow_conv_backprop(NarrowConv *nc, IRRef ref, int depth)
       NarrowIns *savesp = nc->sp;
       int count = narrow_conv_backprop(nc, ir->op1, depth);
       count += narrow_conv_backprop(nc, ir->op2, depth);
-      if (count <= 1) {  /* Limit total number of conversions. */
+      /* Limit total number of conversions. */
+      if (count <= 1 && nc->sp < nc->maxsp) {
 	*nc->sp++ = NARROWINS(IRT(ir->o, nc->t), ref);
 	return count;
       }