diff --git a/webapp/xss_trainer/levels/contrib.py b/webapp/xss_trainer/levels/contrib.py
index ab79f34..3701199 100644
--- a/webapp/xss_trainer/levels/contrib.py
+++ b/webapp/xss_trainer/levels/contrib.py
@@ -18,8 +18,11 @@ class EscapeChars(meta.BaseLevel):
     author = "Sharkmoos"
 
     def sanitise(self, data):
-        # This is more of a level 2/3 difficulty
-        payload = (data.replace("'", "\\'")).replace('"', '\\"')
+        try:
+            int(data)
+            payload = (data.replace("'", "\\'")).replace('"', '\\"')
+        except ValueError:
+            payload = "You must enter a string payload for this level"
         return payload
 
 class Encoding(meta.BaseLevel):