diff --git a/src/lj_parse.c b/src/lj_parse.c
index c0cbd261..afdbcc3d 100644
--- a/src/lj_parse.c
+++ b/src/lj_parse.c
@@ -2527,9 +2527,11 @@ static void parse_for_num(LexState *ls, GCstr *varname, BCLine line)
 */
 static int predict_next(LexState *ls, FuncState *fs, BCPos pc)
 {
-  BCIns ins = fs->bcbase[pc].ins;
+  BCIns ins;
   GCstr *name;
   cTValue *o;
+  if (pc >= fs->bclim) return 0;
+  ins = fs->bcbase[pc].ins;
   switch (bc_op(ins)) {
   case BC_MOV:
     if (bc_d(ins) >= fs->nactvar) return 0;