android-audio-visualizer
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prevent NullPointerException
https://github.com/GautamChibde/android-audio-visualizer/blob/c43691bca3953e623c018fbf314c569eb4c8e771/audiovisualizer/src/main/java/com/chibde/BaseVisualizer.java#L102
replace with
if (visualizer != null) {
visualizer.release();
}
to prevent NullPointerException in case setPlayer is not called