Check for null assets when updating gains

Author: toby-yoyo

scripts/functions/Function_Sound.js

@@ -109,7 +109,11 @@ function audio_update()
 
     // Update and apply gains
     g_AudioGroups.forEach(_group => _group.gain.update());
-    audio_sampledata.forEach(_asset => _asset.gain.update());
+    audio_sampledata.forEach(_asset => {
+        if (_asset != null) {
+            _asset.gain.update();
+        }
+    });
     audio_sounds.forEach(_voice => _voice.updateGain());
 }