diff --git a/pkg/log/watermill_logger.go b/pkg/log/watermill_logger.go
index 4a6c4e41..8f50c858 100644
--- a/pkg/log/watermill_logger.go
+++ b/pkg/log/watermill_logger.go
@@ -60,7 +60,7 @@ func concatFields(fields watermill.LogFields) string {
 	full := ""
 
 	for key, val := range fields {
-		full += fmt.Sprintf("%s=%s, ", key, val)
+		full += fmt.Sprintf("%s=%v, ", key, val)
 	}
 
 	if full != "" {
diff --git a/pkg/models/kanban.go b/pkg/models/kanban.go
index 9b6907d8..264114fd 100644
--- a/pkg/models/kanban.go
+++ b/pkg/models/kanban.go
@@ -119,9 +119,11 @@ func (b *Bucket) ReadAll(s *xorm.Session, auth web.Auth, search string, page int
 
 	// Get all users
 	users := make(map[int64]*user.User)
-	err = s.In("id", userIDs).Find(&users)
-	if err != nil {
-		return
+	if len(userIDs) > 0 {
+		err = s.In("id", userIDs).Find(&users)
+		if err != nil {
+			return
+		}
 	}
 
 	for _, bb := range buckets {
diff --git a/pkg/models/label_task.go b/pkg/models/label_task.go
index de5be5c1..5c94a5c7 100644
--- a/pkg/models/label_task.go
+++ b/pkg/models/label_task.go
@@ -218,9 +218,11 @@ func getLabelsByTaskIDs(s *xorm.Session, opts *LabelByTaskIDsOptions) (ls []*lab
 		userids = append(userids, l.CreatedByID)
 	}
 	users := make(map[int64]*user.User)
-	err = s.In("id", userids).Find(&users)
-	if err != nil {
-		return nil, 0, 0, err
+	if len(userids) > 0 {
+		err = s.In("id", userids).Find(&users)
+		if err != nil {
+			return nil, 0, 0, err
+		}
 	}
 
 	// Obfuscate all user emails
diff --git a/pkg/models/link_sharing.go b/pkg/models/link_sharing.go
index 363897ab..8b7f4c76 100644
--- a/pkg/models/link_sharing.go
+++ b/pkg/models/link_sharing.go
@@ -182,9 +182,11 @@ func (share *LinkSharing) ReadAll(s *xorm.Session, a web.Auth, search string, pa
 	}
 
 	users := make(map[int64]*user.User)
-	err = s.In("id", userIDs).Find(&users)
-	if err != nil {
-		return nil, 0, 0, err
+	if len(userIDs) > 0 {
+		err = s.In("id", userIDs).Find(&users)
+		if err != nil {
+			return nil, 0, 0, err
+		}
 	}
 
 	for _, s := range shares {
diff --git a/pkg/models/list.go b/pkg/models/list.go
index 97cf5d90..118cbdc0 100644
--- a/pkg/models/list.go
+++ b/pkg/models/list.go
@@ -290,6 +290,11 @@ func GetListSimplByTaskID(s *xorm.Session, taskID int64) (l *List, err error) {
 // GetListsByIDs returns a map of lists from a slice with list ids
 func GetListsByIDs(s *xorm.Session, listIDs []int64) (lists map[int64]*List, err error) {
 	lists = make(map[int64]*List, len(listIDs))
+
+	if len(listIDs) == 0 {
+		return
+	}
+
 	err = s.In("id", listIDs).Find(&lists)
 	return
 }
@@ -405,9 +410,11 @@ func addListDetails(s *xorm.Session, lists []*List) (err error) {
 
 	// Get all list owners
 	owners := map[int64]*user.User{}
-	err = s.In("id", ownerIDs).Find(&owners)
-	if err != nil {
-		return
+	if len(ownerIDs) > 0 {
+		err = s.In("id", ownerIDs).Find(&owners)
+		if err != nil {
+			return
+		}
 	}
 
 	var fileIDs []int64
diff --git a/pkg/models/namespace.go b/pkg/models/namespace.go
index b61d5509..4b4c4c63 100644
--- a/pkg/models/namespace.go
+++ b/pkg/models/namespace.go
@@ -657,6 +657,13 @@ func (n *Namespace) Delete(s *xorm.Session, a web.Auth) (err error) {
 		listIDs = append(listIDs, l.ID)
 	}
 
+	if len(listIDs) == 0 {
+		return events.Dispatch(&NamespaceDeletedEvent{
+			Namespace: n,
+			Doer:      a,
+		})
+	}
+
 	// Delete tasks
 	_, err = s.In("list_id", listIDs).Delete(&Task{})
 	if err != nil {
diff --git a/pkg/models/task_attachment.go b/pkg/models/task_attachment.go
index 6d7e7092..457d16d2 100644
--- a/pkg/models/task_attachment.go
+++ b/pkg/models/task_attachment.go
@@ -128,6 +128,10 @@ func (ta *TaskAttachment) ReadAll(s *xorm.Session, a web.Auth, search string, pa
 		return nil, 0, 0, err
 	}
 
+	if len(attachments) == 0 {
+		return
+	}
+
 	fileIDs := make([]int64, 0, len(attachments))
 	userIDs := make([]int64, 0, len(attachments))
 	for _, r := range attachments {
@@ -228,9 +232,11 @@ func getTaskAttachmentsByTaskIDs(s *xorm.Session, taskIDs []int64) (attachments
 	}
 
 	users := make(map[int64]*user.User)
-	err = s.In("id", userIDs).Find(&users)
-	if err != nil {
-		return
+	if len(userIDs) > 0 {
+		err = s.In("id", userIDs).Find(&users)
+		if err != nil {
+			return
+		}
 	}
 
 	// Obfuscate all user emails
diff --git a/pkg/models/task_reminder.go b/pkg/models/task_reminder.go
index 4746fc79..f44c7065 100644
--- a/pkg/models/task_reminder.go
+++ b/pkg/models/task_reminder.go
@@ -49,6 +49,10 @@ type taskUser struct {
 }
 
 func getTaskUsersForTasks(s *xorm.Session, taskIDs []int64) (taskUsers []*taskUser, err error) {
+	if len(taskIDs) == 0 {
+		return
+	}
+
 	// Get all creators of tasks
 	creators := make(map[int64]*user.User, len(taskIDs))
 	err = s.
diff --git a/pkg/models/user_list.go b/pkg/models/user_list.go
index f1552192..b5d369b0 100644
--- a/pkg/models/user_list.go
+++ b/pkg/models/user_list.go
@@ -96,12 +96,20 @@ func ListUsersFromList(s *xorm.Session, l *List, search string) (users []*user.U
 		uids = append(uids, id)
 	}
 
+	var cond builder.Cond = builder.Like{"username", "%" + search + "%"}
+
+	if len(uids) > 0 {
+		cond = builder.And(
+			builder.In("id", uids),
+			cond,
+		)
+	}
+
 	// Get all users
 	err = s.
 		Table("users").
 		Select("*").
-		In("id", uids).
-		And("username LIKE ?", "%"+search+"%").
+		Where(cond).
 		GroupBy("id").
 		OrderBy("id").
 		Find(&users)
diff --git a/pkg/user/user.go b/pkg/user/user.go
index 5a1364c7..838097e3 100644
--- a/pkg/user/user.go
+++ b/pkg/user/user.go
@@ -182,6 +182,11 @@ func GetUserWithEmail(s *xorm.Session, user *User) (userOut *User, err error) {
 // GetUsersByIDs returns a map of users from a slice of user ids
 func GetUsersByIDs(s *xorm.Session, userIDs []int64) (users map[int64]*User, err error) {
 	users = make(map[int64]*User)
+
+	if len(userIDs) == 0 {
+		return users, nil
+	}
+
 	err = s.In("id", userIDs).Find(&users)
 	if err != nil {
 		return