diff --git a/migrations/sqlite3/4_machine_column.sql b/migrations/sqlite3/4_machine_column.sql
index 1b8aac2..4d090e1 100644
--- a/migrations/sqlite3/4_machine_column.sql
+++ b/migrations/sqlite3/4_machine_column.sql
@@ -1,11 +1,11 @@
 -- +migrate Up
 -- SQL in section 'Up' is executed when this migration is applied
 
-alter table users
-    add `machine` varchar(255);
+alter table heartbeats
+    add column `machine` varchar(255);
 
 -- +migrate Down
 -- SQL section 'Down' is executed when this migration is rolled back
 
-alter table users
+alter table heartbeats
     drop column `machine`;
\ No newline at end of file
diff --git a/models/user.go b/models/user.go
index f55c7d4..9a3101d 100644
--- a/models/user.go
+++ b/models/user.go
@@ -37,7 +37,7 @@ func (s *Signup) IsValid() bool {
 }
 
 func validateUsername(username string) bool {
-	return len(username) >= 3
+	return len(username) >= 3 && username != "current"
 }
 
 func validatePassword(password string) bool {
diff --git a/version.txt b/version.txt
index b9268da..0bfbd57 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.8.1
\ No newline at end of file
+1.8.2
\ No newline at end of file