diff --git a/lib/config.js b/lib/config.js
index cdc1bc35..6930949e 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -102,7 +102,7 @@ function checkConfig(conf) {
   conf.hostname; // '0.0.0.0'
 
   // shell, process name
-  if (conf.shell && ~conf.shell.indexOf('/')) {
+  if (conf.shell && typeof conf.shell !== 'function' && ~conf.shell.indexOf('/')) {
     conf.shell = path.resolve(conf.dir, conf.shell);
   }
   conf.shell = conf.shell || process.env.SHELL || 'sh';
diff --git a/lib/tty.js b/lib/tty.js
index 78849eb8..0e4e041c 100644
--- a/lib/tty.js
+++ b/lib/tty.js
@@ -632,6 +632,7 @@ var slice = Array.prototype.slice;
 
 function sanitize(file) {
   if (!file) return '';
+  if (typeof file !== 'string') return file;
   file = file.split(' ')[0] || '';
   return path.basename(file) || '';
 }