From 2e15934666faa7e765e281cb5de83e2bdbbd123b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20S=C3=B6derberg?= <sauilitired@gmail.com>
Date: Sun, 27 Oct 2019 12:01:04 +0100
Subject: [PATCH] Fix `/plot flag set` allowing for invalid flag values. (Fixes
 #2519)

---
 .../intellectualsites/plotsquared/plot/commands/FlagCmd.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Core/src/main/java/com/github/intellectualsites/plotsquared/plot/commands/FlagCmd.java b/Core/src/main/java/com/github/intellectualsites/plotsquared/plot/commands/FlagCmd.java
index 18976edac..af0389dec 100644
--- a/Core/src/main/java/com/github/intellectualsites/plotsquared/plot/commands/FlagCmd.java
+++ b/Core/src/main/java/com/github/intellectualsites/plotsquared/plot/commands/FlagCmd.java
@@ -163,6 +163,11 @@ public class FlagCmd extends SubCommand {
                     MainUtil.sendMessage(player, "&c" + flag.getValueDescription());
                     return false;
                 }
+                if (flag instanceof ListFlag) {
+                    if (!(parsed instanceof Collection) || ((Collection) parsed).isEmpty()) {
+                        return !MainUtil.sendMessage(player, Captions.FLAG_NOT_ADDED);
+                    }
+                }
                 boolean result = plot.setFlag(flag, parsed);
                 if (!result) {
                     MainUtil.sendMessage(player, Captions.FLAG_NOT_ADDED);