From 97cd56cb933147d876b69c93b0ed6369ef598dd3 Mon Sep 17 00:00:00 2001
From: JOO200 <github@joo200.de>
Date: Fri, 14 Aug 2020 00:35:58 +0200
Subject: [PATCH] Bugfix @Values: Completion with null value will create a NPE
 (#282)

---
 core/src/main/java/co/aikar/commands/RegisteredCommand.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/src/main/java/co/aikar/commands/RegisteredCommand.java b/core/src/main/java/co/aikar/commands/RegisteredCommand.java
index c0069f1b..2c875fe3 100644
--- a/core/src/main/java/co/aikar/commands/RegisteredCommand.java
+++ b/core/src/main/java/co/aikar/commands/RegisteredCommand.java
@@ -46,6 +46,7 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
@@ -284,7 +285,8 @@ public class RegisteredCommand<CEC extends CommandExecutionContext<CEC, ? extend
                     //noinspection unchecked
                     List<String> check = commandCompletions.getCompletionValues(this, sender, s, origArgs, opContext.isAsync());
                     if (!check.isEmpty()) {
-                        possible.addAll(check.stream().map(String::toLowerCase).collect(Collectors.toList()));
+                        possible.addAll(check.stream().filter(Objects::nonNull).
+                                map(String::toLowerCase).collect(Collectors.toList()));
                     } else {
                         possible.add(s.toLowerCase(Locale.ENGLISH));
                     }