Fix crash on loading a save that had an old version of Blueprint Extensions.

Author: dewiniaid

README.md

@@ -46,6 +46,9 @@ discussion page, and messages posted there will likely be ignored.**
 
 ## Changelog
 
+### 0.4.1 (2019-04-01)
+* Fix a crash when loading a save that had an old version of Blueprint Extensions installed.
+
 ### 0.4.0 (2019-04-01)
 * New feature: Add landfill to every tile of a blueprint that needs it.  
 * Removed code that disabled blueprint flipping and mirroring when a competing mod was installed.
@@ -54,7 +57,6 @@ discussion page, and messages posted there will likely be ignored.**
 * Substantially overhauled internal event handling code.
 * Lots of code cleanup.
 
-
 ### 0.3.2 (2019-03-02)
 * Fix issues (including a possible crash) involving setting up the blueprint mirroring buttons in a new save.
 

changelog.txt

@@ -1,5 +1,11 @@
+Version: 0.4.1
 ---------------------------------------------------------------------------------------------------
+Date: 01. 04. 2019
+  Bugfixes:
+    - Fix crash on loading a save that had an old version of Blueprint Extensions.
+
 Version: 0.4.0
+---------------------------------------------------------------------------------------------------
 Date: 01. 04. 2019
   New features:
     - Add support for landfilling every tile of a blueprint that needs one.

info.json

@@ -1,6 +1,6 @@
 {
     "name": "BlueprintExtensions",
-    "version": "0.4.0",
+    "version": "0.4.1",
     "title": "Blueprint Extensions",
     "author": "Dewin",
     "contact": "https://github.com/dewiniaid/BlueprintExtensions",

modules/landfill.lua

@@ -15,7 +15,6 @@ local get_overlapping_tiles = Geom2D.get_overlapping_tiles
 
 
 function Landfill.compute_prototype_overrides()
-    --game.print("Landfill.compute_prototype_overrides")
     -- Some entities require special arguments when created.  We skip those; they're unlikely to come up in blueprints
     -- anyways
     local type_blacklist = {
@@ -71,7 +70,7 @@ function Landfill.compute_prototype_overrides()
                     end
                     t[d] = data
 
-                    log("... [" .. name .. "][" .. d .. "] = " .. serpent.line(t[d]))
+                    --log("... [" .. name .. "][" .. d .. "] = " .. serpent.line(t[d]))
                 end
                 e.destroy()
             end
@@ -89,10 +88,12 @@ end
 
 function Landfill.on_load()
     Landfill.prototype_overrides = global.prototype_overrides
-    for ent, dirs in pairs(Landfill.prototype_overrides) do
-        for dir, rects in pairs(dirs) do
-            for _, rect in pairs(rects) do
-                setmetatable(rect, Rect.__mt)
+    if Landfill.prototype_overrides then
+        for ent, dirs in pairs(Landfill.prototype_overrides) do
+            for dir, rects in pairs(dirs) do
+                for _, rect in pairs(rects) do
+                    setmetatable(rect, Rect.__mt)
+                end
             end
         end
     end
@@ -162,7 +163,7 @@ function Landfill.landfill_action(player, event, action)
         y = (entity.position.y or 0) + offset
         dir = entity.direction or 0
 
-        override = (overrides[name] and overrides[name][dir]) or nil
+        override = (overrides and overrides[name] and overrides[name][dir]) or nil
 
         if override then
             for _, source in pairs(override) do