diff --git a/converters.py b/converters.py
index dbb9bfe..eaf4363 100644
--- a/converters.py
+++ b/converters.py
@@ -22,6 +22,10 @@ def convert_level(input, output, params, target):
             r = r.strip().split()
             shape, action, position = -1, 0, -1
 
+            # Anti-bad-notation
+            if "middle" in r and "rotate" in r and ("left" in r or "right" in r):
+                raise fxconv.FxconvError("Bad rotation in '" + " ".join(r) + "'")
+
             # Shape
             if "square" in r:
                 shape = 0