diff --git a/data-computer/v1/lda.py b/data-computer/v1/lda.py
index e8aedc2..b393c50 100755
--- a/data-computer/v1/lda.py
+++ b/data-computer/v1/lda.py
@@ -42,6 +42,8 @@
 #tokenize
 def tokenize(text):
     tokens = [word for word in text.replace("'"," ").split() if word not in stopwords and len(word)>2]
+    if len(tokens)==0:
+        return ["none"]
     return tokens