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-rw-r--r--src/library_browser.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/library_browser.js b/src/library_browser.js
index 300f0b3b..09f8b96c 100644
--- a/src/library_browser.js
+++ b/src/library_browser.js
@@ -47,6 +47,7 @@ mergeInto(LibraryManager.library, {
case 'function': {
wrapper[prop] = function() {
var printArgs = Array.prototype.slice.call(arguments).map(function(arg) {
+ if (typeof arg == 'undefined') return '!UNDEFINED!';
if (!arg) return arg;
if (wrapper.objectMap[arg]) return '<' + arg + '|' + wrapper.objectMap[arg] + '>';
if (arg.toString() == '[object HTMLImageElement]') {