diff --git a/paper-api/src/main/java/org/bukkit/command/PluginCommandYamlParser.java b/paper-api/src/main/java/org/bukkit/command/PluginCommandYamlParser.java
index 67875bcf17..5854583e1a 100644
--- a/paper-api/src/main/java/org/bukkit/command/PluginCommandYamlParser.java
+++ b/paper-api/src/main/java/org/bukkit/command/PluginCommandYamlParser.java
@@ -44,10 +44,18 @@ public class PluginCommandYamlParser {
 
                 if (aliases instanceof List) {
                     for (Object o : (List<?>) aliases) {
+                        if (o.toString().contains(":")) {
+                            Bukkit.getServer().getLogger().severe("Could not load alias " + o.toString() + " for plugin " + plugin.getName() + ": Illegal Characters");
+                            continue;
+                        }
                         aliasList.add(o.toString());
                     }
                 } else {
-                    aliasList.add(aliases.toString());
+                    if (aliases.toString().contains(":")) {
+                        Bukkit.getServer().getLogger().severe("Could not load alias " + aliases.toString() + " for plugin " + plugin.getName() + ": Illegal Characters");
+                    } else {
+                        aliasList.add(aliases.toString());
+                    }
                 }
 
                 newCmd.setAliases(aliasList);
diff --git a/paper-api/src/main/java/org/bukkit/plugin/PluginDescriptionFile.java b/paper-api/src/main/java/org/bukkit/plugin/PluginDescriptionFile.java
index 9e6c1d941a..0d1e3a045a 100644
--- a/paper-api/src/main/java/org/bukkit/plugin/PluginDescriptionFile.java
+++ b/paper-api/src/main/java/org/bukkit/plugin/PluginDescriptionFile.java
@@ -537,7 +537,9 @@ public final class PluginDescriptionFile {
      *     <td>Alternative command names, with special usefulness for commands
      *         that are already registered. <i>Aliases are not effective when
      *         defined at runtime,</i> so the plugin description file is the
-     *         only way to have them properly defined.</td>
+     *         only way to have them properly defined.
+     *         <p>
+     *         Note: Command aliases may not have a colon in them.</td>
      *     <td>Single alias format:
      *         <blockquote><pre>aliases: combust_me</pre></blockquote> or
      *         multiple alias format:
@@ -617,7 +619,7 @@ public final class PluginDescriptionFile {
      *  # Having an empty declaration is useful for defining the description, permission, and messages from a configuration dynamically
      *  apocalypse:
      *</pre></blockquote>
-     * Note: command names may not have a colon in their name.
+     * Note: Command names may not have a colon in their name.
      *
      * @return the commands this plugin will register
      */