diff --git a/internal/postgres/tag.go b/internal/postgres/tag.go
index 4e851e2..405b5a8 100644
--- a/internal/postgres/tag.go
+++ b/internal/postgres/tag.go
@@ -97,7 +97,7 @@ func CreateTagAlias(ctx context.Context, db *gorm.DB, tagAliasName models.Anthro
 		return &otterError.EntityValidationFailed{Reason: "tagAliasName cannot be empty"}
 	}
 	if tagID == "" {
-		return &otterError.EntityValidationFailed{Reason: "tagID cannot be empty"}
+		return &otterError.EntityValidationFailed{Reason: otterError.AnthroveTagIDEmpty}
 	}
 
 	result := db.WithContext(ctx).Create(&models.TagAlias{
@@ -143,7 +143,7 @@ func GetAllTagAliasByTag(ctx context.Context, db *gorm.DB, tagID models.Anthrove
 	var tagAliases []models.TagAlias
 
 	if tagID == "" {
-		return nil, &otterError.EntityValidationFailed{Reason: "tagID cannot be empty"}
+		return nil, &otterError.EntityValidationFailed{Reason: otterError.AnthroveTagIDEmpty}
 	}
 
 	result := db.WithContext(ctx).Where("tag_id = ?", tagID).Find(&tagAliases)
@@ -191,7 +191,7 @@ func CreateTagGroup(ctx context.Context, db *gorm.DB, tagGroupName models.Anthro
 		return &otterError.EntityValidationFailed{Reason: "tagGroupName cannot be empty"}
 	}
 	if tagID == "" {
-		return &otterError.EntityValidationFailed{Reason: "tagID cannot be empty"}
+		return &otterError.EntityValidationFailed{Reason: otterError.AnthroveTagIDEmpty}
 	}
 
 	result := db.WithContext(ctx).Create(&models.TagGroup{
@@ -237,7 +237,7 @@ func GetAllTagGroupByTag(ctx context.Context, db *gorm.DB, tagID models.Anthrove
 	var tagGroups []models.TagGroup
 
 	if tagID == "" {
-		return nil, &otterError.EntityValidationFailed{Reason: "tagID cannot be empty"}
+		return nil, &otterError.EntityValidationFailed{Reason: otterError.AnthroveTagIDEmpty}
 	}
 
 	result := db.WithContext(ctx).Where("tag_id = ?", tagID).Find(&tagGroups)
diff --git a/pkg/error/validation.go b/pkg/error/validation.go
index 48b8632..27ec3c4 100644
--- a/pkg/error/validation.go
+++ b/pkg/error/validation.go
@@ -7,6 +7,7 @@ const (
 	AnthroveUserIDToShort   = "anthrovePostID needs to be 25 characters long"
 	AnthroveSourceIDEmpty   = "anthroveSourceID cannot be empty"
 	AnthroveSourceIDToShort = "anthroveSourceID needs to be 25 characters long"
+	AnthroveTagIDEmpty      = "tagID cannot be empty"
 )
 
 type EntityValidationFailed struct {