Use Flask-Hashids package

app/corpora/cqi_over_socketio/__init__.py

@@ -57,7 +57,7 @@ from .cqi import *  # noqa
 def connect(auth):
     # the auth variable is used in a hacky way. It contains the corpus id for
     # which a corpus analysis session should be started.
-    corpus_id = hashids.decode(auth['corpus_id'])[0]
+    corpus_id = hashids.decode(auth['corpus_id'])
     corpus = Corpus.query.get(corpus_id)
     if corpus is None:
         # return {'code': 404, 'msg': 'Not Found'}