src/lcode.js: Fix luaH_set result check

1 files changed, 4 insertions, 3 deletions

diff --git a/src/lcode.js b/src/lcode.js
index b697b16..8d903a6 100644
--- a/src/lcode.js
+++ b/src/lcode.js
@@ -485,10 +485,11 @@ const freeexps = function(fs, e1, e2) {
 const addk = function(fs, key, v) {
     let f = fs.f;
     let idx = ltable.luaH_set(fs.ls.h, key);  /* index scanner table */
-    if (idx && !idx.ttisnil()) {  /* is there an index there? */
+    if (idx.ttisinteger()) {  /* is there an index there? */
+        let k = idx.value;
         /* correct value? (warning: must distinguish floats from integers!) */
-        if (idx.value < fs.nk && f.k[idx.value].ttype() === v.ttype() && f.k[idx.value].value === v.value)
-            return idx.value;  /* reuse index */
+        if (k < fs.nk && f.k[k].ttype() === v.ttype() && f.k[k].value === v.value)
+            return k;  /* reuse index */
     }
     /* constant not found; create a new entry */
     let k = fs.nk;