diff --git a/lib/kill.mjs b/lib/kill.mjs
index 114c604..f02dc05 100644
--- a/lib/kill.mjs
+++ b/lib/kill.mjs
@@ -43,10 +43,14 @@ function buildTree(allPids, spawnGetChildren, parentPid) {
   ps.stdout.on('data', function(buf) {
     data += buf.toString('ascii')
   })
+  ps.stderr.on('data', function(buf) {
+    data += buf.toString('ascii')
+  })
 
   return new Promise(function(res) {
     ps.on('close', function(code) {
       // Check if we got error code (usually means empty results)
+      console.log(data)
       if (code !== 0) return res()
 
       res(Promise.all(