diff --git a/maps/fish_defender/explosive_gun_bullets.lua b/maps/fish_defender/explosive_gun_bullets.lua
index 1891c3d9..09932da2 100644
--- a/maps/fish_defender/explosive_gun_bullets.lua
+++ b/maps/fish_defender/explosive_gun_bullets.lua
@@ -2,8 +2,8 @@ local radius = 3
 
 local function splash_damage(surface, position, final_damage_amount)
 	local damage = math.random(math.floor(final_damage_amount * 3), math.floor(final_damage_amount * 4))
-	for _, e in pairs(surface.find_entities_filtered({area = {{position.x - radius, position.y - radius},{position.x + radius, position.y + radius}}})) do		
-		if e.health then
+	for _, e in pairs(surface.find_entities_filtered({area = {{position.x - radius, position.y - radius},{position.x + radius, position.y + radius}}})) do
+		if e.valid and e.health then
 			local distance_from_center = math.sqrt((e.position.x - position.x) ^ 2 + (e.position.y - position.y) ^ 2)
 			if distance_from_center <= radius then
 				local damage_distance_modifier = 1 - distance_from_center / radius
@@ -23,9 +23,9 @@ local function explosive_bullets(event)
 	if player.shooting_state.state == defines.shooting.not_shooting then return false end
 	local selected_weapon = player.get_inventory(defines.inventory.character_guns)[player.selected_gun_index]
 	if selected_weapon.name ~= "submachine-gun" and selected_weapon.name ~= "pistol" then return false end
-	
+
 	player.surface.create_entity({name = "explosion", position = event.entity.position})
-	
+
 	splash_damage(
 		player.surface,
 		event.entity.position,
@@ -34,5 +34,3 @@ local function explosive_bullets(event)
 end
 
 return explosive_bullets
-
-