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-rw-r--r--src/lapi.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lapi.js b/src/lapi.js
index 6840ef9..5872545 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -542,7 +542,7 @@ const lua_toboolean = function(L, idx) {
const lua_tolstring = function(L, idx) {
let o = index2addr(L, idx);
- if (!o.ttisstring() && !o.ttisnumber())
+ if ((!o.ttisstring() && !o.ttisnumber()))
return null;
return o.ttisstring() ? o.jsstring() : `${o.value}`;