diff --git a/src/main/java/me/skymc/taboolib/commands/internal/BaseMainCommand.java b/src/main/java/me/skymc/taboolib/commands/internal/BaseMainCommand.java
index 0aa3af3..d9c9eb8 100644
--- a/src/main/java/me/skymc/taboolib/commands/internal/BaseMainCommand.java
+++ b/src/main/java/me/skymc/taboolib/commands/internal/BaseMainCommand.java
@@ -119,7 +119,7 @@ public abstract class BaseMainCommand implements IMainCommand, CommandExecutor,
 
     @Override
     public List<String> onTabComplete(CommandSender commandSender, Command command, String s, String[] args) {
-        return args.length == 1 ? subCommands.stream().filter(internalCommandExecutor -> internalCommandExecutor != null && (args[0].isEmpty() || internalCommandExecutor.getLabel().startsWith(args[0]))).map(ISubCommand::getLabel).collect(Collectors.toList()) : null;
+        return args.length == 1 ? subCommands.stream().filter(internalCommandExecutor -> internalCommandExecutor != null && (args[0].isEmpty() || internalCommandExecutor.getLabel().toLowerCase().startsWith(args[0].toLowerCase()))).map(ISubCommand::getLabel).collect(Collectors.toList()) : null;
     }
 
     @Override
diff --git a/src/main/java/me/skymc/taboolib/commands/taboolib/VariableGetCommand.java b/src/main/java/me/skymc/taboolib/commands/taboolib/VariableGetCommand.java
index ec338b6..7688b43 100644
--- a/src/main/java/me/skymc/taboolib/commands/taboolib/VariableGetCommand.java
+++ b/src/main/java/me/skymc/taboolib/commands/taboolib/VariableGetCommand.java
@@ -14,12 +14,12 @@ public class VariableGetCommand extends SubCommand {
         super(sender, args);
 
         if (args.length < 3) {
-            TLocale.sendTo(sender, "COAMMNDS.PARAMETER.INSUFFICIENT");
+            TLocale.sendTo(sender, "COMMANDS.PARAMETER.INSUFFICIENT");
             return;
         }
 
         if (!("-a".equals(args[1]) || "-s".equals(args[1]))) {
-            TLocale.sendTo(sender, "COAMMNDS.TABOOLIB.VARIABLE.READ-ERROR-TYPE");
+            TLocale.sendTo(sender, "COMMANDS.TABOOLIB.VARIABLE.READ-ERROR-TYPE");
             return;
         }
 
@@ -32,7 +32,7 @@ public class VariableGetCommand extends SubCommand {
             value = GlobalDataManager.getVariableAsynchronous(args[2], null);
         }
 
-        TLocale.sendTo(sender, "COAMMNDS.TABOOLIB.VARIABLE.READ-SUCCESS", String.valueOf(System.currentTimeMillis() - time));
-        TLocale.sendTo(sender, "COAMMNDS.TABOOLIB.VARIABLE.READ-RESULT", value == null ? "null" : value);
+        TLocale.sendTo(sender, "COMMANDS.TABOOLIB.VARIABLE.READ-SUCCESS", String.valueOf(System.currentTimeMillis() - time));
+        TLocale.sendTo(sender, "COMMANDS.TABOOLIB.VARIABLE.READ-RESULT", value == null ? "null" : value);
     }
 }
diff --git a/src/main/java/me/skymc/taboolib/commands/taboolib/VariableSetCommand.java b/src/main/java/me/skymc/taboolib/commands/taboolib/VariableSetCommand.java
index 1e7c257..d1f9634 100644
--- a/src/main/java/me/skymc/taboolib/commands/taboolib/VariableSetCommand.java
+++ b/src/main/java/me/skymc/taboolib/commands/taboolib/VariableSetCommand.java
@@ -11,12 +11,12 @@ public class VariableSetCommand extends SubCommand {
         super(sender, args);
 
         if (args.length < 4) {
-            TLocale.sendTo(sender, "COAMMNDS.PARAMETER.INSUFFICIENT");
+            TLocale.sendTo(sender, "COMMANDS.PARAMETER.INSUFFICIENT");
             return;
         }
 
         if (!("-a".equals(args[1]) || "-s".equals(args[1]))) {
-            TLocale.sendTo(sender, "COAMMNDS.TABOOLIB.VARIABLE.WRITE-ERROR-TYPE");
+            TLocale.sendTo(sender, "COMMANDS.TABOOLIB.VARIABLE.WRITE-ERROR-TYPE");
             return;
         }
 
@@ -29,7 +29,7 @@ public class VariableSetCommand extends SubCommand {
             GlobalDataManager.setVariableAsynchronous(args[2], value);
         }
 
-        TLocale.sendTo(sender, "COAMMNDS.TABOOLIB.VARIABLE.WRITE-SUCCESS", String.valueOf(System.currentTimeMillis() - time));
+        TLocale.sendTo(sender, "COMMANDS.TABOOLIB.VARIABLE.WRITE-SUCCESS", String.valueOf(System.currentTimeMillis() - time));
         setReturn(true);
     }
 }