NPE when the () after a method name are missing

This script causes a NPE:

class AsmNPETest
{
int x

}

Here is my stacktrace:

java.lang.NullPointerException
at org.codehaus.groovy.classgen.AsmClassGenerator.visitReturnStatement(AsmClassGenerator.java:1016)
at org.codehaus.groovy.ast.stmt.ReturnStatement.visit(ReturnStatement.java:74)
at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:83)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:102)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:586)
at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:82)
at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:83)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:102)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:586)
at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:82)
at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:83)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:102)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:586)
at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:82)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:49)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:54)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructorOrMethod(AsmClassGenerator.java:506)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructor(ClassCodeVisitorSupport.java:58)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructor(AsmClassGenerator.java:537)
at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:833)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:36)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:330)
at org.codehaus.groovy.control.CompilationUnit$9.call(CompilationUnit.java:746)
at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:947)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:478)