diff --git a/infection_monkey/exploit/elasticgroovy.py b/infection_monkey/exploit/elasticgroovy.py
index cdd3e0dcb..182b8d792 100644
--- a/infection_monkey/exploit/elasticgroovy.py
+++ b/infection_monkey/exploit/elasticgroovy.py
@@ -204,7 +204,7 @@ class ElasticGroovyExploiter(HostExploiter):
         """
         result = self.attack_query(payload)
         if not result:  # not vulnerable
-            return False
+            return ""
         return result[0]
 
     def attack_query(self, payload):