Prevent null concatenation when /deleteblocks is provided an incorrect format

diff --git a/builtin/game/chatcommands.lua b/builtin/game/chatcommands.lua
index 8ce1cfef58b135c8da74eb089c3bda1ec887e16c..2d94817e8f016fbef245c45a3edcdaec72e26756 100644 (file)
--- a/builtin/game/chatcommands.lua
+++ b/builtin/game/chatcommands.lua
@@ -420,6 +420,10 @@ core.register_chatcommand("deleteblocks", {
                        p2 = p1
                else
                        local pos1, pos2 = unpack(param:split(") ("))
+                       if pos1 == nil or pos2 == nil then
+                               return false, "Incorrect area format. Expected: (x1,y1,z1) (x2,y2,z2)"
+                       end
+
                        p1 = core.string_to_pos(pos1 .. ")")
                        p2 = core.string_to_pos("(" .. pos2)