crash.log

e: java.lang.IllegalStateException: Backend Internal error: Exception during code generation
Cause: Back-end (JVM) Internal error: Descriptor can be left only if it is last: val value: kotlin.Boolean? defined in SomeGsonTypeAdapter.read.<anonymous>[LocalVariableDescriptor@562c6d94]
Cause: Descriptor can be left only if it is last: val value: kotlin.Boolean? defined in SomeGsonTypeAdapter.read.<anonymous>[LocalVariableDescriptor@562c6d94]
File being compiled at position: (47,13) in SomeGsonTypeAdapter.kt
The root cause was thrown at: FrameMap.kt:49
File being compiled at position: file:///SomeGsonTypeAdapter.kt
The root cause was thrown at: ExpressionCodegen.java:319
	at org.jetbrains.kotlin.codegen.CompilationErrorHandler.lambda$static$0(CompilationErrorHandler.java:24)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generate(PackageCodegenImpl.java:74)
	at org.jetbrains.kotlin.codegen.DefaultCodegenFactory.generatePackage(CodegenFactory.kt:97)
	at org.jetbrains.kotlin.codegen.DefaultCodegenFactory.generateModule(CodegenFactory.kt:68)
	at org.jetbrains.kotlin.codegen.KotlinCodegenFacade.doGenerateFiles(KotlinCodegenFacade.java:47)
	at org.jetbrains.kotlin.codegen.KotlinCodegenFacade.compileCorrectFiles(KotlinCodegenFacade.java:39)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.generate(KotlinToJVMBytecodeCompiler.kt:446)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:142)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:161)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:57)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:96)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:52)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:93)
	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:362)
	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:102)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileIncrementally(IncrementalCompilerRunner.kt:225)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.access$compileIncrementally(IncrementalCompilerRunner.kt:39)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner$compile$2.invoke(IncrementalCompilerRunner.kt:91)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:103)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.execIncrementalCompiler(CompileServiceImpl.kt:597)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.access$execIncrementalCompiler(CompileServiceImpl.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:454)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:1020)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:101)
	at org.jetbrains.kotlin.daemon.common.DummyProfiler.withMeasure(PerfUtils.kt:137)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.checkedCompile(CompileServiceImpl.kt:1062)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.doCompile(CompileServiceImpl.kt:1019)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:453)
	at sun.reflect.GeneratedMethodAccessor112.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
	at sun.rmi.transport.Transport$1.run(Transport.java:200)
	at sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: Descriptor can be left only if it is last: val value: kotlin.Boolean? defined in SomeGsonTypeAdapter.read.<anonymous>[LocalVariableDescriptor@562c6d94]
Cause: Descriptor can be left only if it is last: val value: kotlin.Boolean? defined in SomeGsonTypeAdapter.read.<anonymous>[LocalVariableDescriptor@562c6d94]
File being compiled at position: (47,13) in SomeGsonTypeAdapter.kt
The root cause was thrown at: FrameMap.kt:49
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:319)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.genStatement(ExpressionCodegen.java:398)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:359)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.returnExpression(ExpressionCodegen.java:1669)
	at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$FunctionDefault.doGenerateBody(FunctionGenerationStrategy.java:64)
	at org.jetbrains.kotlin.codegen.ClosureGenerationStrategy.doGenerateBody(ClosureGenerationStrategy.kt:34)
	at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$CodegenBased.generateBody(FunctionGenerationStrategy.java:84)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethodBody(FunctionCodegen.java:645)
	at org.jetbrains.kotlin.codegen.inline.PsiSourceCompilerForInline.generateMethodBody(SourceCompilerForInline.kt:192)
	at org.jetbrains.kotlin.codegen.inline.PsiSourceCompilerForInline.generateLambdaBody(SourceCompilerForInline.kt:144)
	at org.jetbrains.kotlin.codegen.inline.ExpressionLambda.generateLambdaBody(LambdaInfo.kt:189)
	at org.jetbrains.kotlin.codegen.inline.InlineCodegen.generateClosuresBodies(InlineCodegen.kt:372)
	at org.jetbrains.kotlin.codegen.inline.InlineCodegen.inlineCall(InlineCodegen.kt:256)
	at org.jetbrains.kotlin.codegen.inline.InlineCodegen.performInline(InlineCodegen.kt:163)
	at org.jetbrains.kotlin.codegen.inline.PsiInlineCodegen.genCallInner(InlineCodegen.kt:750)
	at org.jetbrains.kotlin.codegen.CallGenerator$DefaultImpls.genCall(CallGenerator.kt:114)
	at org.jetbrains.kotlin.codegen.inline.PsiInlineCodegen.genCall(InlineCodegen.kt:731)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:2482)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:2420)
	at org.jetbrains.kotlin.codegen.Callable$invokeMethodWithArguments$1.invoke(Callable.kt:41)
	at org.jetbrains.kotlin.codegen.Callable$invokeMethodWithArguments$1.invoke(Callable.kt:13)
	at org.jetbrains.kotlin.codegen.OperationStackValue.putSelector(StackValue.kt:79)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:112)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:101)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.generateBlock(ExpressionCodegen.java:1251)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.generateBlock(ExpressionCodegen.java:1190)
	at org.jetbrains.kotlin.codegen.CodegenStatementVisitor.visitBlockExpression(CodegenStatementVisitor.java:56)
	at org.jetbrains.kotlin.codegen.CodegenStatementVisitor.visitBlockExpression(CodegenStatementVisitor.java:22)
	at org.jetbrains.kotlin.psi.KtBlockExpression.accept(KtBlockExpression.java:44)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:296)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.genStatement(ExpressionCodegen.java:398)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:359)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.returnExpression(ExpressionCodegen.java:1669)
	at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$FunctionDefault.doGenerateBody(FunctionGenerationStrategy.java:64)
	at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$CodegenBased.generateBody(FunctionGenerationStrategy.java:84)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethodBody(FunctionCodegen.java:645)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethodBody(FunctionCodegen.java:474)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethod(FunctionCodegen.java:264)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethod(FunctionCodegen.java:182)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.gen(FunctionCodegen.java:153)
	at org.jetbrains.kotlin.codegen.MemberCodegen.genSimpleMember(MemberCodegen.java:195)
	at org.jetbrains.kotlin.codegen.ClassBodyCodegen.generateDeclaration(ClassBodyCodegen.java:155)
	at org.jetbrains.kotlin.codegen.ClassBodyCodegen.generateBody(ClassBodyCodegen.java:75)
	at org.jetbrains.kotlin.codegen.MemberCodegen.generate(MemberCodegen.java:127)
	at org.jetbrains.kotlin.codegen.MemberCodegen.genClassOrObject(MemberCodegen.java:300)
	at org.jetbrains.kotlin.codegen.MemberCodegen.genClassOrObject(MemberCodegen.java:284)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generateClassOrObject(PackageCodegenImpl.java:161)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generateClassesAndObjectsInFile(PackageCodegenImpl.java:86)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generateFile(PackageCodegenImpl.java:119)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generate(PackageCodegenImpl.java:66)
	... 43 more
Caused by: java.lang.IllegalStateException: Descriptor can be left only if it is last: val value: kotlin.Boolean? defined in SomeGsonTypeAdapter.read.<anonymous>[LocalVariableDescriptor@562c6d94]
	at org.jetbrains.kotlin.codegen.FrameMapBase.leave(FrameMap.kt:49)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.lambda$addLeaveTaskToRemoveLocalVariableFromFrameMap$9(ExpressionCodegen.java:1403)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.lambda$generateBlock$8(ExpressionCodegen.java:1268)
	at org.jetbrains.kotlin.codegen.StackValueWithLeaveTask.putSelector(StackValue.kt:68)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:112)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:101)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.putStackValue(ExpressionCodegen.java:375)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:360)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:355)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.generateLoopBody(ExpressionCodegen.java:683)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.generateWhile(ExpressionCodegen.java:553)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.lambda$visitWhileExpression$1(ExpressionCodegen.java:538)
	at org.jetbrains.kotlin.codegen.OperationStackValue.putSelector(StackValue.kt:79)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:112)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:101)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.generateBlock(ExpressionCodegen.java:1251)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.generateBlock(ExpressionCodegen.java:1192)
	at org.jetbrains.kotlin.codegen.CodegenStatementVisitor.visitBlockExpression(CodegenStatementVisitor.java:56)
	at org.jetbrains.kotlin.codegen.CodegenStatementVisitor.visitBlockExpression(CodegenStatementVisitor.java:22)
	at org.jetbrains.kotlin.psi.KtBlockExpression.accept(KtBlockExpression.java:44)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.genQualified(ExpressionCodegen.java:296)
	... 92 more

SomeGsonTypeAdapterSnippet.kt

                val value: Boolean? = when (val type = peek()) {
                    JsonToken.BOOLEAN -> nextBoolean()
                    JsonToken.NULL -> nextNull().let { null }
                    else -> throw Error("Unexpected type $type")
                }