Exception decompiling

// This method has failed to decompile. When submitting a bug report, please provide this stack trace, and (if you hold appropriate legal rights) the relevant class file.
// org.benf.cfr.reader.util.ConfusedCFRException: Tried to end blocks [3[TRYBLOCK]], but top level block is 9[UNCONDITIONALDOLOOP]
// org.benf.cfr.reader.bytecode.analysis.opgraph.Op04StructuredStatement.processEndingBlocks(Op04StructuredStatement.java:427)
// org.benf.cfr.reader.bytecode.analysis.opgraph.Op04StructuredStatement.buildNestedBlocks(Op04StructuredStatement.java:479)
// org.benf.cfr.reader.bytecode.analysis.opgraph.Op03SimpleStatement.createInitialStructuredBlock(Op03SimpleStatement.java:607)
// org.benf.cfr.reader.bytecode.CodeAnalyser.getAnalysisInner(CodeAnalyser.java:696)
// org.benf.cfr.reader.bytecode.CodeAnalyser.getAnalysisOrWrapFail(CodeAnalyser.java:184)
// org.benf.cfr.reader.bytecode.CodeAnalyser.getAnalysis(CodeAnalyser.java:129)
// org.benf.cfr.reader.entities.attributes.AttributeCode.analyse(AttributeCode.java:96)
// org.benf.cfr.reader.entities.Method.analyse(Method.java:397)
// org.benf.cfr.reader.entities.ClassFile.analyseMid(ClassFile.java:906)
// org.benf.cfr.reader.entities.ClassFile.analyseTop(ClassFile.java:797)
// org.benf.cfr.reader.Driver.doClass(Driver.java:58)
// org.benf.cfr.reader.CfrDriverImpl.analyse(CfrDriverImpl.java:67)
// org.benf.cfr.reader.Main.main(Main.java:48)
// the.bytecode.club.bytecodeviewer.decompilers.CFRDecompiler.decompileClassNode(CFRDecompiler.java:131)
// the.bytecode.club.bytecodeviewer.gui.ClassViewer$12.doShit(ClassViewer.java:971)
// the.bytecode.club.bytecodeviewer.gui.PaneUpdaterThread.run(PaneUpdaterThread.java:57)

So what causes this?

Start with the stack trace at CFRDecompiler.java:131 and the failing CFR paths in Op04StructuredStatement.java:427 and :479. A relevant class file is not included, so first obtain or reproduce the input that triggers the exception. Done means identifying the cause and documenting or testing a fix for the decompilation failure.