fix for empty interval

Upgrade.lua

@@ -184,10 +184,10 @@ function upgrade.attempt(natives)
 	game.surfaces[1].print("Rampant - Version 0.16.6")
 	global.version = constants.VERSION_41
     end
-    if (global.version < constants.VERSION_42) then
+    if (global.version < constants.VERSION_43) then
 	
-	game.surfaces[1].print("Rampant - Version 0.16.7")
-	global.version = constants.VERSION_42
+	game.surfaces[1].print("Rampant - Version 0.16.8")
+	global.version = constants.VERSION_43
     end
     
     return starting ~= global.version, natives

changelog.txt

@@ -1,3 +1,9 @@
+---------------------------------------------------------------------------------------------------
+Version: 0.16.8
+Date: 1. 26. 2018
+  Bugfixes:
+    - Added a check for 0 elements on_tick empty interval (https://forums.factorio.com/viewtopic.php?f=94&t=31445&start=220#p338531)
+
 ---------------------------------------------------------------------------------------------------
 Version: 0.16.7
 Date: 1. 26. 2018

libs/BaseUtils.lua

@@ -236,7 +236,7 @@ end
 
 function baseUtils.upgradeBase(base)
     local paths = BASE_ALIGNMENT_PATHS[base.alignment]
-    if paths then
+    if paths and (#paths > 0) then
 	base.alignment = paths[mRandom(#paths)]
 	return true
     end

libs/Constants.lua

@@ -18,7 +18,7 @@ constants.VERSION_28 = 28
 constants.VERSION_33 = 33
 constants.VERSION_38 = 38
 constants.VERSION_41 = 41
-constants.VERSION_42 = 42
+constants.VERSION_43 = 43
 
 -- misc