diff --git a/jarvis_util/shell/exec_info.py b/jarvis_util/shell/exec_info.py
index 94108fd..4c68e34 100644
--- a/jarvis_util/shell/exec_info.py
+++ b/jarvis_util/shell/exec_info.py
@@ -82,7 +82,7 @@ def __init__(self,  exec_type=ExecType.LOCAL, nprocs=None, ppn=None,
         self.exec_async = exec_async
         self.stdin = stdin
         self.keys = ['exec_type', 'nprocs', 'ppn', 'user', 'pkey', 'port',
-                     'hostfile', 'env', 'sleep_ms', 'sudo',
+                     'hostfile', 'env', 'sleep_ms', 'sudo', 'sudoenv',
                      'cwd', 'hosts', 'collect_output',
                      'pipe_stdout', 'pipe_stderr', 'hide_output',
                      'exec_async', 'stdin']
diff --git a/jarvis_util/shell/ssh_exec.py b/jarvis_util/shell/ssh_exec.py
index e207971..36e6ec3 100644
--- a/jarvis_util/shell/ssh_exec.py
+++ b/jarvis_util/shell/ssh_exec.py
@@ -29,9 +29,10 @@ def __init__(self, cmd, exec_info):
         cmd = self.smash_cmd(cmd, self.sudo, self.basic_env, exec_info.sudoenv)
         if not exec_info.hostfile.is_local():
             super().__init__(self.ssh_cmd(cmd),
-                             exec_info.mod(env=exec_info.basic_env))
+                             exec_info.mod(env=exec_info.basic_env,
+                                           sudo=False))
         else:
-            super().__init__(cmd, exec_info)
+            super().__init__(cmd, exec_info.mod(sudo=False))
 
     def ssh_cmd(self, cmd):
         lines = ['ssh']
diff --git a/jarvis_util/util/import_mod.py b/jarvis_util/util/import_mod.py
index 3104c27..d752205 100644
--- a/jarvis_util/util/import_mod.py
+++ b/jarvis_util/util/import_mod.py
@@ -24,7 +24,10 @@ def load_class(import_str, path, class_name):
     """
     if len(path):
         sys.path.insert(0, path)
-    module = __import__(import_str, fromlist=[class_name])
+    try:
+        module = __import__(import_str, fromlist=[class_name])
+    except:
+        return None
     if len(path):
         sys.path.pop(0)
     return getattr(module, class_name)