rxjs-fruits
                                
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                        Bug report
Steps to reproduce
- Complete last level.
- Click next button.
- Open dev-tool and you will keep receiving errors.
 
                                    
                                    
                                    
                                
Logic broken here?
this.currentLevelIndex = this.nextUnsolvedLevelIndex();
nextUnsolvedLevelIndex will return undefined after all levels finished. Thus setting  currentLevelIndex  as undefined  caused no valid level as correct reference.