Fix linux's "signal_w" startup crash

Author: Quezler

mods_2.0/041_underground-heat-pipe/changelog.txt

@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 2.0.4
+Date: 2025. 01. 09
+  Info:
+    - Fix linux's "signal_w" startup crash
+---------------------------------------------------------------------------------------------------
 Version: 2.0.3
 Date: 2025. 01. 06
   Info:

mods_2.0/041_underground-heat-pipe/info.json

@@ -3,7 +3,7 @@
     "title": "Underground heat pipe",
     "description": "Not enough space above ground? underground has free real estate.",
 
-    "version": "2.0.3",
+    "version": "2.0.4",
     "author": "Quezler",
     "factorio_version": "2.0",
 

mods_2.0/041_underground-heat-pipe/prototypes/underground-heat-pipe.lua

@@ -161,7 +161,7 @@ function UndergroundHeatPipe.make(config)
       for _, even_or_odd in ipairs({"even", "odd"}) do -- adjacent heat pipes with the same name still try to visually form connections.
         local icons = table.deepcopy(uhp.icons)
         table.insert(icons, {
-          icon = "__base__/graphics/icons/signal/signal_" .. direction_name:sub(1, 1) .. ".png",
+          icon = "__base__/graphics/icons/signal/signal_" .. direction_name:sub(1, 1):upper() .. ".png",
           icon_size = 64,
           scale = 0.25,
           shift = {-8, -8}