Parenthesized class name causes NPE in RuleBuilder (MVEL)

declare Foo
clazz : Class
end
rule testFoo
when
Foo( clazz == (java.lang.Object) )
then
System.out.println( "Foo is Object" );
end

causes

Exception in thread "main" [Error: not a statement, or badly formed structure]
[Near :

]
^
[Line: 1, Column: 19]
at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:307)
at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:69)
at org.mvel2.MVEL.analysisCompile(MVEL.java:668)
at org.mvel2.MVEL.analysisCompile(MVEL.java:672)
at org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:779)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:540)
at org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:349)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:264)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:122)
at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:81)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1889)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:755)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:365)
at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:543)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
at listofthree.Main.setup(Main.java:55)
at listofthree.Main.main(Main.java:107)
Caused by: java.lang.NullPointerException
at java.lang.Class.isAssignableFrom(Native Method)
at org.mvel2.DataConversion.canConvert(DataConversion.java:104)
at org.mvel2.ast.TypeCast.<init>(TypeCast.java:47)
at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:1034)
at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:135)
... 17 more