diff --git a/server/concordia_preprocessor.py b/server/concordia_preprocessor.py
index 38f6cf0..bb80bb1 100755
--- a/server/concordia_preprocessor.py
+++ b/server/concordia_preprocessor.py
@@ -10,11 +10,11 @@ api = Api(app)
 
 
 lemmatizer = spacy.load('en', disable=['parser', 'ner'])
-app.logger.info("Lemmatizer initialized")
+print("Lemmatizer initialized")
 
 pickle_in = open("dictionaries/dict.pickle","rb")
 dictionary = pickle.load(pickle_in)
-app.logger.info("Dictionary initialized")
+print("Dictionary initialized")
 
 
 
diff --git a/server/lemmatizer_resource.py b/server/lemmatizer_resource.py
index e074510..dc9a6d9 100644
--- a/server/lemmatizer_resource.py
+++ b/server/lemmatizer_resource.py
@@ -17,6 +17,9 @@ class LemmatizerResource(Resource):
             return {'error':'Missing parameter: sentences'}, 400
 
         language = json_data['language']
+        if language not in ['pl', 'en']:
+            return {'error':'Unsupported language: %s' % language}, 400
+
 
         sentences = []
         for sentence in json_data['sentences']:
@@ -34,7 +37,7 @@ class LemmatizerResource(Resource):
         if len(word) == 1:
             return word
         lemma = None
-        if language == 'pl':
+        if language == 'pl':            
             lemma = self.dictionary.get(word, None)
             if lemma is None:
                 lemma = word