diff --git a/pattern.py b/pattern.py
index ee88a01..dd6c7df 100644
--- a/pattern.py
+++ b/pattern.py
@@ -89,13 +89,14 @@ def pat(index, tick, previous_values):
     this.values['index'] = index
     if this.pattern != None:
         for i in range(len(this.pattern)):
-            name = this.pattern[i]['instruction']['name']
-            targets = this.pattern[i]['instruction']['targets']
-            args = []
-            if 'args' in this.pattern[i]['instruction']:
-                args = this.pattern[i]['instruction']['args']
-            if this.instructions[name] != None:
-                apply(targets, args, this.instructions[name])
+            if i < len(this.pattern):
+                name = this.pattern[i]['instruction']['name']
+                targets = this.pattern[i]['instruction']['targets']
+                args = []
+                if 'args' in this.pattern[i]['instruction']:
+                    args = this.pattern[i]['instruction']['args']
+                if this.instructions[name] != None:
+                    apply(targets, args, this.instructions[name])
         r = this.values["r"]
         g = this.values["g"]
         b = this.values["b"]