diff --git a/Fourmi.py b/Fourmi.py
index a0f54a4..7c3cf7d 100755
--- a/Fourmi.py
+++ b/Fourmi.py
@@ -8,6 +8,7 @@ Version: v0.0.1 - Empty Application that could do something but all logic of web
 from twisted.internet import reactor
 from scrapy.crawler import Crawler
 from scrapy import log, signals
+from FourmiCrawler.parsers.parser import Parser
 from FourmiCrawler.spider import FourmiSpider
 from scrapy.utils.project import get_project_settings
 import os, inspect, re
@@ -16,13 +17,15 @@ def load_parsers(rel_dir="FourmiCrawler/parsers"):
     path = os.path.dirname(os.path.abspath(__file__))
     path += "/" + rel_dir
     parsers = []
+    known_parser = set()
 
     for py in [f[:-3] for f in os.listdir(path) if f.endswith('.py') and f != '__init__.py']:
         mod = __import__('.'.join([rel_dir.replace("/", "."), py]), fromlist=[py])
         classes = [getattr(mod, x) for x in dir(mod) if inspect.isclass(getattr(mod, x))]
         for cls in classes:
-            if re.match(path + "/*", inspect.getfile(cls)):
+            if issubclass(cls, Parser) and cls not in known_parser:
                 parsers.append(cls()) # [review] - Would we ever need arguments for the parsers?
+                known_parser.add(cls)
     return parsers
 
 def setup_crawler(searchables):
diff --git a/FourmiCrawler/spider.py b/FourmiCrawler/spider.py
index 42f1e15..327de42 100644
--- a/FourmiCrawler/spider.py
+++ b/FourmiCrawler/spider.py
@@ -25,7 +25,9 @@ class FourmiSpider(Spider):
     def get_synonym_requests(self, compound):
         requests = []
         for parser in self.__parsers:
-            requests.append(parser.new_compound_request(compound))
+            parser_requests = parser.new_compound_request(compound)
+            if parser_requests is not None:
+                requests.append(parser_requests)
         return requests
 
     def start_requests(self):