diff -r b07c7c256771 -r 4fca8ddf46de vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Sep 28 14:45:00 2012 +0200
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Sep 28 14:58:21 2012 +0200
@@ -358,6 +358,9 @@
                 case bc_aconst_null:
                     out.append("stack.push(null);");
                     break;
+                case bc_iconst_m1:
+                    out.append("stack.push(-1);");
+                    break;
                 case bc_iconst_0:
                 case bc_dconst_0:
                 case bc_lconst_0: