//replacemix: fix crash caused by invalid invocation

CHANGELOG.md

@@ -26,6 +26,7 @@ Note to self: See the bottom of this file for the release template text.
      - `moretrees:apple_tree_sapling_ongen` from `apple` to `apple_moretrees`
      - Add `plum` → `plumtree:sapling`
      - Add `holly` ⇒ `hollytree:sapling`
+ - `//replacemix`: Improve error handling to avoid crashes (thanks, Jonathon for reporting via Discord!)
 
 
 ## v1.12: The selection tools update (26th June 2021)

worldeditadditions_commands/commands/replacemix.lua

@@ -53,6 +53,9 @@ worldedit.register_command("replacemix", {
 				end
 			end
 		end
+		if not target_node then return false, "Error: No target node specified." end
+		if not last_node_name then return false, "Error: At least 1 replace node must be specified." end
+		
 		if not replace_nodes[last_node_name] then
 			replace_nodes[last_node_name] = 1
 		end