diff --git a/upgrade-machines/changelog.txt b/upgrade-machines/changelog.txt
index ecfe5bc..60daf8a 100644
--- a/upgrade-machines/changelog.txt
+++ b/upgrade-machines/changelog.txt
@@ -1,4 +1,14 @@
 ---------------------------------------------------------------------------------------------------
+Version: 1.1.0
+Date: 12. 01. 2021
+  Bug fix:
+    - Fix that Burner Assembling to Assembling machine 1 created a crash on load
+---------------------------------------------------------------------------------------------------
+Version: 1.1.0
+Date: 12. 01. 2021
+  General:
+    - Update for 1.1
+---------------------------------------------------------------------------------------------------
 Version: 1.0.0
 Date: 31. 10. 2020
   General:
@@ -126,4 +136,4 @@ Date: 08. 10. 2017
     - Stone to steel furnace
     - Steel to electric furnace
     - Burner to electric inserter
-    - Burner to electric drill
\ No newline at end of file
+    - Burner to electric drill
diff --git a/upgrade-machines/data-final-fixes.lua b/upgrade-machines/data-final-fixes.lua
index e6b8b1d..e23bea3 100644
--- a/upgrade-machines/data-final-fixes.lua
+++ b/upgrade-machines/data-final-fixes.lua
@@ -1,14 +1,18 @@
-if data.raw.recipe["basic-circuit-board"] then
+if data.raw.recipe["basic-circuit-board"] and data.raw.recipe["burner-to-electric-inserter"] then
     data.raw.recipe["burner-to-electric-inserter"].ingredients = {
         { "basic-circuit-board", 1 },
         { "burner-inserter", 1 }
     }
+end
+if data.raw.recipe["basic-circuit-board"] and data.raw.recipe["burner-to-electric-drill"] then
     data.raw.recipe["burner-to-electric-drill"].normal.ingredients = {
         { "burner-mining-drill", 1 },
         { "iron-gear-wheel", 2 },
         { "iron-plate", 7 },
         { "basic-circuit-board", 3},
     }
+end
+if data.raw.recipe["basic-circuit-board"] and data.raw.recipe["burner-assembling-to-assembling-machine-1"] then
     data.raw.recipe["burner-assembling-to-assembling-machine-1"].ingredients = {
         { "burner-assembling-machine", 1 },
         { "basic-circuit-board", 3 },
diff --git a/upgrade-machines/info.json b/upgrade-machines/info.json
index af3fb4f..584bc03 100644
--- a/upgrade-machines/info.json
+++ b/upgrade-machines/info.json
@@ -1,11 +1,11 @@
 {
     "name": "upgrade-machines",
-    "version": "1.0.0",
+    "version": "1.1.1",
     "title": "Upgrade Machines",
     "author": "Jelmergu",
     "contact": "",
     "homepage": "",
-    "factorio_version": "1.0",
+    "factorio_version": "1.1",
     "dependencies": ["base >= 0.16.22", "? bobelectronics >= 0.15.2", "? bobplates >= 0.15.12"],
     "description": "This mod adds recipes to upgrade all burner stage machines to their next tier machine"
-}
\ No newline at end of file
+}
diff --git a/upgrade-machines/lib/helpers.lua b/upgrade-machines/lib/helpers.lua
index 33abff6..7f15cd7 100644
--- a/upgrade-machines/lib/helpers.lua
+++ b/upgrade-machines/lib/helpers.lua
@@ -40,4 +40,4 @@ function var_dump(table)
     if data ~= nil then -- during data stage
         log(serpent.block(table))
     end
-end
\ No newline at end of file
+end
diff --git a/upgrade-machines/migrations/2020-10-31_upgrade_machines_1.0.0.lua b/upgrade-machines/migrations/2020-10-31_upgrade_machines_1.0.0.lua
index 41937d9..0a60931 100644
--- a/upgrade-machines/migrations/2020-10-31_upgrade_machines_1.0.0.lua
+++ b/upgrade-machines/migrations/2020-10-31_upgrade_machines_1.0.0.lua
@@ -1,14 +1,12 @@
-for _, force in pairs(game.forces) do
-    if force.technologies["bob-steam-turbine-1"].researched == true then
-        force.recipes["steam-engine-to-steam-turbine"].enabled = false
-        force.recipes["steam-engine-to-steam-turbine"].reload()
-    end
-    if force.technologies["bob-heat-exchanger-1"].researched == true then
-        force.recipes["boiler-to-heat-exchanger"].enabled = false
-        force.recipes["boiler-to-heat-exchanger"].reload()
-    end
-    if force.technologies["automation"].researched == true then
-        force.recipes["burner-assembling-to-assembling-machine-1"].enabled = true
-        force.recipes["burner-assembling-to-assembling-machine-1"].reload()
+function enable_recipe_if_tech_exists(force, tech, recipe)
+    if force.technologies[tech] ~= nil and force.recipes[recipe] ~= nil and force.technologies[tech].researched == true then
+        force.recipes[recipe].enabled = false
+        force.recipes[recipe].reload()
     end
+end
+
+for _, force in pairs(game.forces) do
+    enable_recipe_if_tech_exists(force, "bob-steam-turbine-1", "steam-engine-to-steam-turbine")
+    enable_recipe_if_tech_exists(force, "bob-heat-exchanger-1", "boiler-to-heat-exchanger")
+    enable_recipe_if_tech_exists(force, "automation", "burner-assembling-to-assembling-machine-1")
 end
\ No newline at end of file
diff --git a/upgrade-machines/prototypes/recipes/vanilla.lua b/upgrade-machines/prototypes/recipes/vanilla.lua
index b2147f9..d16c239 100644
--- a/upgrade-machines/prototypes/recipes/vanilla.lua
+++ b/upgrade-machines/prototypes/recipes/vanilla.lua
@@ -108,7 +108,7 @@ Jelmergu:addRecipe(
         {
             name = "shotgun-to-combat-shotgun",
             ingredients = {
-                { "pistol", 1 },
+                { "shotgun", 1 },
                 { "steel-plate", 14 },
             },
             result = "combat-shotgun",