diff --git a/lib/common/empire.py b/lib/common/empire.py
index 5074265ff..5607c4b09 100644
--- a/lib/common/empire.py
+++ b/lib/common/empire.py
@@ -1326,6 +1326,10 @@ def do_sleep(self, line):
             if len(parts) == 3:
                 jitter = parts[2]
 
+            if jitter < 0 or jitter >= 1:
+                print helpers.color("[!] Jitter is a decimal between 0.0 and 1.0'")
+                return
+
             allAgents = self.mainMenu.agents.get_agents_db()
 
             for agent in allAgents:
@@ -1357,6 +1361,10 @@ def do_sleep(self, line):
             if len(parts) == 3:
                 jitter = parts[2]
 
+            if jitter < 0 or jitter >= 1:
+                print helpers.color("[!] Jitter is a decimal between 0.0 and 1.0'")
+                return
+
             if sessionID and len(sessionID) != 0:
                 # update this agent's information in the database
                 self.mainMenu.agents.set_agent_field_db('delay', delay, sessionID)