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-rw-r--r--tools/node.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/node.js b/tools/node.js
index 29d5632d..eba2bc1d 100644
--- a/tools/node.js
+++ b/tools/node.js
@@ -131,7 +131,7 @@ exports.minify = function(files, options) {
var stream = UglifyJS.OutputStream(output);
toplevel.print(stream);
- if(options.outSourceMap){
+ if (options.outSourceMap && "string" === typeof options.outSourceMap) {
stream += "\n//# sourceMappingURL=" + options.outSourceMap;
}