diff --git a/app/models/post_appeal.rb b/app/models/post_appeal.rb
index 718d61069..5ccb115a8 100644
--- a/app/models/post_appeal.rb
+++ b/app/models/post_appeal.rb
@@ -35,7 +35,7 @@ class PostAppeal < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase)
+        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase.strip.tr(" ", "_"))
       end
 
       if params[:post_id].present?
diff --git a/app/models/post_flag.rb b/app/models/post_flag.rb
index 8d3124c85..3c9f8d909 100644
--- a/app/models/post_flag.rb
+++ b/app/models/post_flag.rb
@@ -36,7 +36,7 @@ class PostFlag < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase)
+        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase.strip.tr(" ", "_"))
       end
 
       if params[:post_id].present?
diff --git a/app/models/tag_subscription.rb b/app/models/tag_subscription.rb
index dcc3c297e..dda43cc92 100644
--- a/app/models/tag_subscription.rb
+++ b/app/models/tag_subscription.rb
@@ -71,7 +71,7 @@ class TagSubscription < ActiveRecord::Base
     end
 
     if params[:creator_name]
-      q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase)
+      q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase.strip.tr(" ", "_"))
     end
 
     q
diff --git a/app/models/user_feedback.rb b/app/models/user_feedback.rb
index 4ce908d07..ed8f5e7ff 100644
--- a/app/models/user_feedback.rb
+++ b/app/models/user_feedback.rb
@@ -36,7 +36,7 @@ class UserFeedback < ActiveRecord::Base
       end
 
       if params[:user_name].present?
-        q = q.where("user_id = (select _.id from users _ where lower(_.name) = ?)", params[:user_name].mb_chars.downcase)
+        q = q.where("user_id = (select _.id from users _ where lower(_.name) = ?)", params[:user_name].mb_chars.downcase.strip.tr(" ", "_"))
       end
 
       if params[:creator_id].present?
@@ -44,7 +44,7 @@ class UserFeedback < ActiveRecord::Base
       end
 
       if params[:creator_name].present?
-        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase)
+        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].mb_chars.downcase.strip.tr(" ", "_"))
       end
 
       if params[:category].present?