handle a few exceptions

burpui/cli.py

@@ -717,7 +717,7 @@ exclude_comp=gz
             'Setting it to 15.'
         )
         confsrv['max_status_children'] = 15
-    elif confsrv.version < BURP_BIND_MULTIPLE:
+    elif confsrv.version and confsrv.version < BURP_BIND_MULTIPLE:
         max_status_children = confsrv.get('max_status_children')
         if not max_status_children or max_status_children < 15:
             confsrv['max_status_children'] = 15

burpui/extensions.py

@@ -232,7 +232,7 @@ def create_websocket(myapp, websocket_server=False, celery_worker=False,
             redis_url = 'redis://{}:{}/{}'.format(host, port, db)
         myapp.config['WS_MESSAGE_QUEUE'] = redis_url
     myapp.config['WS_MANAGE_SESSION'] = not myapp.config.get('WITH_SRV_SESSION', False)
-    if os.getenv('BUI_MODE') == 'celery':
+    if os.getenv('BUI_MODE', '') == 'celery':
         myapp.config['WS_ASYNC_MODE'] = 'threading'
     # myapp.config['WS_ASYNC_MODE'] = 'threading' if not gunicorn else None
 

burpui/misc/backend/burp2.py

@@ -475,7 +475,7 @@ class Burp(Burp1):
             ret['percent'] = round(
                 float(ret['bytes']) / float(ret['estimated_bytes']) * 100
             )
-        except ZeroDivisionError:
+        except ZeroDivisionError, KeyError:
             # You know... division by 0
             ret['percent'] = 0