fix corner case in evaluate (#3540)

fixes #3539
2019-10-28 19:56:42 +08:00
parent 24e8b47977
commit f38e31bd1e
2 changed files with 17 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2901,6 +2901,7 @@ merge(Compressor.prototype, {
            }
            if (isNaN(result)) return compressor.find_parent(AST_With) ? this : result;
            if (compressor.option("unsafe_math")
+                && result
                && typeof result == "number"
                && (this.operator == "+" || this.operator == "-")) {
                var digits = Math.max(0, decimals(left), decimals(right));