diff -r a218f7befd55 -r 3155e77d2676 src/share/classes/com/sun/tools/javac/comp/Attr.java
--- a/src/share/classes/com/sun/tools/javac/comp/Attr.java	Thu Jul 25 11:02:27 2013 +0200
+++ b/src/share/classes/com/sun/tools/javac/comp/Attr.java	Thu Jul 25 14:47:43 2013 +0100
@@ -2970,7 +2970,9 @@
                 //check that functional interface class is well-formed
                 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
                         names.empty, List.of(fExpr.targets.head), ABSTRACT);
-                chk.checkImplementations(env.tree, csym, csym);
+                if (csym != null) {
+                    chk.checkImplementations(env.tree, csym, csym);
+                }
             }
         }
     }