--- Faster/Faster.xs	2006/03/10 00:11:44	1.6
+++ Faster/Faster.xs	2006/03/10 22:18:39	1.7
@@ -70,6 +70,9 @@
 {
 	OP *op;
 
+        if (!ptr)
+          croak ("NULL not allowed as code address for patch_cv");
+
 	NewOp (0, op, 1, OP);
 
         op->op_sibling = CvSTART (cv);