Fix crashes caused by non-existent entities.

src/sound.rs

@@ -6,6 +6,7 @@ use bevy_openal::{Buffer, Context, Sound, SoundState};
 use rand::random;
 
 use crate::{
+    commands::RunIfExistsExt,
     core::{Coordinates, CoreConfig, Player, PointLike},
     exploration::ExplorationFocused,
     visibility::{Viewshed, VisibleEntities},
@@ -91,12 +92,15 @@ fn add_footstep_sounds(
 ) {
     for (entity, footstep) in footsteps.iter() {
         let buffer = assets.get_handle(footstep.sound);
-        commands.entity(entity).insert(Sound {
+        let gain = footstep.gain;
+        commands.run_if_exists(entity, move |mut entity| {
+            entity.insert(Sound {
                 buffer,
                 state: SoundState::Stopped,
-            gain: footstep.gain,
+                gain,
                 ..Default::default()
             });
+        });
     }
 }
 
@@ -138,18 +142,25 @@ fn add_sound_icon_sounds(
 ) {
     for (entity, icon) in icons.iter() {
         let buffer = assets.get_handle(icon.sound);
+        let gain = icon.gain;
+        let pitch = icon.pitch;
         let looping = icon.interval.is_none();
-        commands.entity(entity).insert(Sound {
+        let reference_distance = icon.reference_distance;
+        let max_distance = icon.max_distance;
+        let rolloff_factor = icon.rolloff_factor;
+        commands.run_if_exists(entity, move |mut entity| {
+            entity.insert(Sound {
                 buffer,
-            gain: icon.gain,
+                gain,
-            pitch: icon.pitch,
+                pitch,
                 looping,
                 state: SoundState::Stopped,
-            reference_distance: icon.reference_distance,
+                reference_distance,
-            max_distance: icon.max_distance,
+                max_distance,
-            rolloff_factor: icon.rolloff_factor,
+                rolloff_factor,
                 ..Default::default()
             });
+        });
     }
 }