diff --git a/stable/python/_kubeless.py b/stable/python/_kubeless.py
index 07ff81025..9e0edfebb 100755
--- a/stable/python/_kubeless.py
+++ b/stable/python/_kubeless.py
@@ -3,21 +3,31 @@
 import importlib
 import io
 import os
-import queue
 import sys
-
+import threading
 import bottle
 import prometheus_client as prom
-
+import queue
 
 # The reason this file has an underscore prefix in its name is to avoid a
 # name collision with the user-defined module.
+module_name = os.getenv('MOD_NAME')
+if module_name is None:
+    print('MOD_NAME have to be provided', flush=True)
+    exit(1)
 current_mod = os.path.basename(__file__).split('.')[0]
-if os.getenv('MOD_NAME') == current_mod:
-    raise ValueError(f'Module cannot be named {current_mod}')
+if module_name == current_mod:
+    print('Module cannot be named {} as current module'.format(current_mod), flush=True)
+    exit(2)
 
 sys.path.append('/kubeless')
-mod = importlib.import_module(os.getenv('MOD_NAME'))
+
+mod = importlib.import_module(module_name)
+func_name = os.getenv('FUNC_HANDLER')
+if func_name is None:
+    print('FUNC_HANDLER have to be provided', flush=True)
+    exit(3)
+
 func = getattr(mod, os.getenv('FUNC_HANDLER'))
 func_port = os.getenv('FUNC_PORT', 8080)
 timeout = float(os.getenv('FUNC_TIMEOUT', 180))
@@ -67,13 +77,6 @@ def __setstate__(self, env):
         setattr(self, 'environ', env)
 
 
-def funcWrap(q, event, c):
-    try:
-        q.put(func(event, c))
-    except Exception as inst:
-        q.put(inst)
-
-
 @app.get('/healthz')
 def healthz():
     return 'OK'
@@ -85,6 +88,11 @@ def metrics():
     return prom.generate_latest(prom.REGISTRY)
 
 
+@app.error(500)
+def exception_handler():
+    return 'Internal server error'
+
+
 @app.route('/<:re:.*>', method=['GET', 'POST', 'PATCH', 'DELETE'])
 def handler():
     req = bottle.request
@@ -106,24 +114,17 @@ def handler():
     func_calls.labels(method).inc()
     with func_errors.labels(method).count_exceptions():
         with func_hist.labels(method).time():
-            q = ctx.Queue()
-            p = ctx.Process(target=funcWrap, args=(q, event, function_context))
-            p.start()
-
+            que = queue.Queue()
+            t = threading.Thread(target=lambda q, e: q.put(func(e,function_context)), args=(que,event))
+            t.start()
             try:
-                res = q.get(block=True, timeout=timeout)
+                res = que.get(block=True, timeout=timeout)
             except queue.Empty:
-                p.terminate()
-                p.join()
                 return bottle.HTTPError(408, "Timeout while processing the function")
             else:
-                p.join()
-                if isinstance(res, Exception) and not isinstance(res, bottle.HTTPResponse):
-                    logging.error("Function returned an exception: %s", res)
-                    raise res
+                t.join()
                 return res
 
-
 def preload():
     """This is a no-op function used to start the forkserver."""
     pass