diff --git a/pyren/mod_elm.py b/pyren/mod_elm.py
index 81332dc..792702e 100644
--- a/pyren/mod_elm.py
+++ b/pyren/mod_elm.py
@@ -1459,13 +1459,13 @@ class ELM:
         #     self.send_raw('at cfc1')
             # print 'cfc1', raw_command
 
-        if raw_command[Fc].startswith('0'):
+        if raw_command[Fc].startswith('0') and uncutCommand in self.l1_cache.keys():
             frsp = self.send_raw ('STPX D:' + raw_command[Fc] + ',R:' + self.l1_cache[uncutCommand])
+        elif raw_command[Fc].startswith('1'):
+            frsp = self.send_raw ('STPX D:' + raw_command[Fc] + ',R:' + '1')
         else:
             frsp = self.send_raw ('STPX D:' + raw_command[Fc])
-        
-        if raw_command[Fc].startswith('1'):
-            frsp = self.send_raw ('STPX D:' + raw_command[Fc] + ',R:' + '1')
+    
 
         while Fc < Fn:
             # if Fn > 1 and (Fn - Fc) == 1: