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Fix possible nullrefs.
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@ -17,7 +17,7 @@ namespace osu.Game.Rulesets.Objects
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var hitObjectY = y as DrawableHitObject;
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var hitObjectY = y as DrawableHitObject;
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// If either of the two drawables are not hit objects, fall back to the base comparer
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// If either of the two drawables are not hit objects, fall back to the base comparer
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if ((hitObjectX ?? hitObjectY) == null)
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if ((hitObjectX?.HitObject ?? hitObjectY?.HitObject) == null)
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return base.Compare(x, y);
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return base.Compare(x, y);
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// Compare by start time
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// Compare by start time
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@ -41,7 +41,7 @@ namespace osu.Game.Rulesets.Objects
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var hitObjectY = y as DrawableHitObject;
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var hitObjectY = y as DrawableHitObject;
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// If either of the two drawables are not hit objects, fall back to the base comparer
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// If either of the two drawables are not hit objects, fall back to the base comparer
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if ((hitObjectX ?? hitObjectY) == null)
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if ((hitObjectX?.HitObject ?? hitObjectY?.HitObject) == null)
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return base.Compare(x, y);
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return base.Compare(x, y);
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// Compare by start time
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// Compare by start time
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