diff --git a/misp_modules/__init__.py b/misp_modules/__init__.py
index 1edfc86..1c1713b 100644
--- a/misp_modules/__init__.py
+++ b/misp_modules/__init__.py
@@ -217,6 +217,7 @@ def main():
     argParser.add_argument('-d', default=False, action='store_true', help='Enable debugging')
     argParser.add_argument('-p', default=6666, help='misp-modules TCP port (default 6666)')
     argParser.add_argument('-l', default='localhost', help='misp-modules listen address (default localhost)')
+    argParser.add_argument('-m', default=[], action='append', help='Register a custom module')
     args = argParser.parse_args()
     port = args.p
     listen = args.l
@@ -232,6 +233,11 @@ def main():
         helpersdir = 'helpers'
         load_helpers(helpersdir=helpersdir)
         mhandlers, loaded_modules = load_modules(modulesdir)
+
+    for module in args.m:
+        mispmod = importlib.import_module(module)
+        mispmod.register(mhandlers, loaded_modules)
+        
     service = [(r'/modules', ListModules), (r'/query', QueryModule)]
 
     application = tornado.web.Application(service)
diff --git a/misp_modules/modules/expansion/cve.py b/misp_modules/modules/expansion/cve.py
index e370116..81d8db5 100755
--- a/misp_modules/modules/expansion/cve.py
+++ b/misp_modules/modules/expansion/cve.py
@@ -19,8 +19,11 @@ def handler(q=False):
     r = requests.get(cveapi_url + request.get('vulnerability'))
     if r.status_code == 200:
         vulnerability = json.loads(r.text)
-        if vulnerability.get('summary'):
-            summary = vulnerability['summary']
+        if vulnerability:
+            if vulnerability.get('summary'):
+                summary = vulnerability['summary']
+        else:
+            summary = 'Non existing CVE'
     else:
         misperrors['error'] = 'cve.circl.lu API not accessible'
         return misperrors['error']
diff --git a/misp_modules/modules/import_mod/openiocimport.py b/misp_modules/modules/import_mod/openiocimport.py
index d5e39a0..c237bdc 100755
--- a/misp_modules/modules/import_mod/openiocimport.py
+++ b/misp_modules/modules/import_mod/openiocimport.py
@@ -4,23 +4,20 @@ import base64
 from pymisp.tools import openioc
 
 misperrors = {'error': 'Error'}
-userConfig = {
-            'not save ioc': {
-                'type': 'Boolean',
-                'message': 'If you check this box, IOC file will not save as an attachment in MISP'
-            },
-            'default tag': {
-                'type': 'String',
-                'message': 'Add tags spaced by a comma (tlp:white,misp:threat-level="no-risk")',
-                'validation' : '0'
-            }
-        }
+userConfig = {'not save ioc': {'type': 'Boolean',
+                               'message': 'If you check this box, IOC file will not save as an attachment in MISP'
+                               },
+              'default tag': {
+                  'type': 'String',
+                  'message': 'Add tags spaced by a comma (tlp:white,misp:threat-level="no-risk")',
+                  'validation': '0'}
+              }
 
 inputSource = ['file']
 
 moduleinfo = {'version': '0.1', 'author': 'Raphaël Vinot',
-            'description': 'Import OpenIOC package',
-            'module-type': ['import']}
+              'description': 'Import OpenIOC package',
+              'module-type': ['import']}
 
 moduleconfig = []
 
@@ -47,27 +44,23 @@ def handler(q=False):
 
     if q.get('config'):
         if q['config'].get('not save ioc') == "0":
-            addFile = {
-                    "values": [q.get('filename')],
-                    "types": ['attachment'],
-                    "categories": ['Support Tool'],
-                    "data" : q.get('data'),
-                    }
+            addFile = {"values": [q.get('filename')],
+                       "types": ['attachment'],
+                       "categories": ['Support Tool'],
+                       "data": q.get('data')}
             # add tag
             if q['config'].get('default tag') is not None:
                 addFile["tags"] = q['config']['default tag'].split(",")
             # add file as attachment
             r["results"].append(addFile)
 
-
     # return all attributes
     for attrib in pkg.attributes:
         toAppend = {
             "values": [attrib.value],
             "types": [attrib.type],
             "categories": [attrib.category],
-            "comment":attrib.comment
-            }
+            "comment": getattr(attrib, 'comment', '')}
         # add tag
         if q.get('config') and q['config'].get('default tag') is not None:
                 toAppend["tags"] = q['config']['default tag'].split(",")