diff options
Diffstat (limited to 'lib/js')
-rw-r--r-- | lib/js/urweb.js | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js index c7cecbbf..4daee66d 100644 --- a/lib/js/urweb.js +++ b/lib/js/urweb.js @@ -301,6 +301,9 @@ function listener() { } function rv(chn, parse, k) { + if (chn == null) + return; + if (chn < 0) whine("Out-of-bounds channel receive"); |