Fixed rare physics crash

core/src/mindustry/async/PhysicsProcess.java

@@ -26,6 +26,7 @@ public class PhysicsProcess implements AsyncProcess{
     private PhysicsWorld[] physics;
     private Seq<PhysicRef> refs = new Seq<>(false, 20, PhysicRef.class);
     private Seq<Future<?>> futures = new Seq<>(false, layers, Future.class);
+    private Seq<PhysicRef> pendingAdds = new Seq<>(false, 20, PhysicRef.class);
 
     private static volatile long maxPhysicsTime = 0;
 
@@ -44,7 +45,8 @@ public class PhysicsProcess implements AsyncProcess{
         PhysicRef ref = new PhysicRef(unit, body);
         refs.add(ref);
 
-        if(ref.lastLayer >= 0) physics[ref.lastLayer].add(body);
+        //defer adds until physics update is done
+        pendingAdds.add(ref);
     }
 
     @Override
@@ -68,6 +70,13 @@ public class PhysicsProcess implements AsyncProcess{
         PerfCounter.unitPhysicsAsync.add(maxPhysicsTime);
         maxPhysicsTime = 0;
 
+        //flush newly added entities
+        for(int i = 0; i < pendingAdds.size; i++){
+           PhysicRef ref = pendingAdds.items[i];
+           if(ref.lastLayer >= 0) physics[ref.lastLayer].add(ref.body);
+        }
+        pendingAdds.clear();
+
         //move entities
         for(PhysicRef ref : refs){
             Physicsc entity = ref.entity;

gradle.properties

@@ -26,4 +26,4 @@ org.gradle.caching=true
 org.gradle.internal.http.socketTimeout=100000
 org.gradle.internal.http.connectionTimeout=100000
 android.enableR8.fullMode=false
-archash=8eb00ffff0
+archash=7445105cd2