diff --git a/lsusers.py b/lsusers.py
index 9d5e0dd..39281b4 100755
--- a/lsusers.py
+++ b/lsusers.py
@@ -36,16 +36,19 @@ def get_users_list():
 
 
 def get_resources_percent(username=None):
-    if username is None:
-        user_opt = ['-e']
-    else:
-        user_opt = ['-u', username]
-    cmd = Popen(['ps', '-o', 'pcpu', '--no-headers'] + user_opt, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
-    output = list(map(float, cmd.stdout.read().decode('utf8').split()))
-    cpu_percent = sum(output) / NCPUS
-    cmd = Popen(['ps', '-o', 'pmem', '--no-headers'] + user_opt, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
-    output = map(float, cmd.stdout.read().decode('utf8').split())
-    mem_percent = sum(output)
+    try:
+        if username is None:
+            user_opt = ['-e']
+        else:
+            user_opt = ['-u', username]
+        cmd = Popen(['ps', '-o', 'pcpu', '--no-headers'] + user_opt, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
+        output = list(map(float, cmd.stdout.read().decode('utf8').split()))
+        cpu_percent = sum(output) / NCPUS
+        cmd = Popen(['ps', '-o', 'pmem', '--no-headers'] + user_opt, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
+        output = map(float, cmd.stdout.read().decode('utf8').split())
+        mem_percent = sum(output)
+    except:
+        cpu_percent = mem_percent = 0
     return cpu_percent, mem_percent