ProGuard stacktrace

gistfile1.txt

java.lang.IllegalArgumentException: Value is not a reference value [proguard.evaluation.value.InstructionOffsetValue]
 at proguard.evaluation.value.Value.referenceValue(Value.java:89)
 at proguard.optimize.evaluation.SimpleEnumUseSimplifier.isPoppingSimpleEnum(SimpleEnumUseSimplifier.java:496)
 at proguard.optimize.evaluation.SimpleEnumUseSimplifier.isPoppingSimpleEnum(SimpleEnumUseSimplifier.java:486)
 at proguard.optimize.evaluation.SimpleEnumUseSimplifier.visitVariableInstruction(SimpleEnumUseSimplifier.java:222)
 at proguard.classfile.instruction.VariableInstruction.accept(VariableInstruction.java:321)
 at proguard.optimize.evaluation.SimpleEnumUseSimplifier.visitCodeAttribute(SimpleEnumUseSimplifier.java:135)
 at proguard.classfile.attribute.CodeAttribute.accept(CodeAttribute.java:97)
 at proguard.classfile.ProgramMethod.attributesAccept(ProgramMethod.java:74)
 at proguard.classfile.attribute.visitor.AllAttributeVisitor.visitProgramMember(AllAttributeVisitor.java:94)
 at proguard.classfile.util.SimplifiedVisitor.visitProgramMethod(SimplifiedVisitor.java:83)
 at proguard.classfile.ProgramMethod.accept(ProgramMethod.java:68)
 at proguard.classfile.ProgramClass.methodsAccept(ProgramClass.java:413)
 at proguard.classfile.visitor.AllMethodVisitor.visitProgramClass(AllMethodVisitor.java:45)
 at proguard.classfile.ProgramClass.accept(ProgramClass.java:285)
 at proguard.classfile.ClassPool.classesAccept(ClassPool.java:116)
 at proguard.optimize.Optimizer.execute(Optimizer.java:397)
 at proguard.ProGuard.optimize(ProGuard.java:264)
 at proguard.ProGuard.execute(ProGuard.java:104)
 at proguard.ProGuard.main(ProGuard.java:411)