diff --git a/app/models/owner.rb b/app/models/owner.rb
index 75ec6a2c3..d348970f0 100644
--- a/app/models/owner.rb
+++ b/app/models/owner.rb
@@ -70,7 +70,7 @@ class Owner < ApplicationRecord
 
   scope :like, lambda { |keywords|
     # 表情处理
-    keywords = keywords.each_char.select { |c| c.bytes.first < 240 }.join('')
+    keywords = keywords.to_s.each_char.select { |c| c.bytes.first < 240 }.join('')
     sql = "CONCAT(lastname, firstname) LIKE :search OR nickname LIKE :search OR login LIKE :search "
     where(sql, :search => "%#{keywords.strip}%") unless keywords.blank?
   }
diff --git a/app/models/user.rb b/app/models/user.rb
index 997053e0c..5e21212ab 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -186,7 +186,7 @@ class User < Owner
   scope :active, lambda { where(status: [STATUS_ACTIVE, STATUS_EDIT_INFO]) }
   scope :like, lambda { |keywords|
     # 表情处理
-    keywords = keywords.each_char.select { |c| c.bytes.first < 240 }.join('')
+    keywords = keywords.to_s.each_char.select { |c| c.bytes.first < 240 }.join('')
     sql = "CONCAT(lastname, firstname) LIKE :search OR nickname LIKE :search OR login LIKE :search OR mail LIKE :search OR nickname LIKE :search"
     where(sql, :search => "%#{keywords.strip}%") unless keywords.blank?
   }