question: Map < String , String > addPresetsToTags ( PresetItem preset , LinkedHashMap < String , String > tags ) { LinkedHashMap < String , String > leftOvers = new LinkedHashMap < String , String > ( ) ; if ( preset != null ) { List < PresetItem > linkedPresetList = preset . getLinkedPresets ( ) ; for ( String key : tags . keySet ( ) ) { if ( preset . hasKeyValue ( key , tags . get ( key ) ) ) { storePreset ( key , preset ) ; } else { boolean found = false ; if ( linkedPresetList != null ) { for ( PresetItem linkedPreset : linkedPresetList ) { if ( linkedPreset . hasKeyValue ( key , tags . get ( key ) ) ) { storePreset ( key , linkedPreset ) ; found = true ; break ; } } } if ( ! found ) { leftOvers . put ( key , tags . get ( key ) ) ; } } } } else { Log . e ( DEBUG_TAG , "addPresetsToTags called with null preset" ) ; } return leftOvers ; }
target:  Don't call with null preset