java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at proguard.evaluation.Variables.fload(Variables.java:245)
at proguard.evaluation.Processor.visitVariableInstruction(Processor.java:678)
at proguard.classfile.instruction.VariableInstruction.accept(VariableInstruction.java:306)
at proguard.optimize.evaluation.PartialEvaluator.evaluateSingleInstructionBlock(PartialEvaluator.java:761)
at proguard.optimize.evaluation.PartialEvaluator.evaluateInstructionBlock(PartialEvaluator.java:609)
at proguard.optimize.evaluation.PartialEvaluator.evaluateInstructionBlockAndExceptionHandlers(PartialEvaluator.java:567)
at proguard.optimize.evaluation.PartialEvaluator.visitCodeAttribute0(PartialEvaluator.java:271)
at proguard.optimize.evaluation.PartialEvaluator.visitCodeAttribute(PartialEvaluator.java:188)
at proguard.optimize.evaluation.LivenessAnalyzer.visitCodeAttribute(LivenessAnalyzer.java:205)
at proguard.optimize.evaluation.VariableOptimizer.visitCodeAttribute(VariableOptimizer.java:105)
at proguard.classfile.attribute.CodeAttribute.accept(CodeAttribute.java:101)
at proguard.classfile.ProgramMethod.attributesAccept(ProgramMethod.java:79)
at proguard.classfile.attribute.visitor.AllAttributeVisitor.visitProgramMember(AllAttributeVisitor.java:95)
at proguard.classfile.util.SimplifiedVisitor.visitProgramMethod(SimplifiedVisitor.java:92)
at proguard.classfile.ProgramMethod.accept(ProgramMethod.java:71)
at proguard.classfile.ProgramClass.methodsAccept(ProgramClass.java:516)
at proguard.classfile.visitor.AllMethodVisitor.visitProgramClass(AllMethodVisitor.java:47)
at proguard.classfile.ProgramClass.accept(ProgramClass.java:358)
at proguard.classfile.ClassPool.classesAccept(ClassPool.java:124)
at proguard.optimize.Optimizer.execute(Optimizer.java:954)
at proguard.ProGuard.optimize(ProGuard.java:328)
at proguard.ProGuard.execute(ProGuard.java:127)

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