diff --git a/routes/api/v1/authors_add_update.go b/routes/api/v1/authors_add_update.go
index b540c57..5c358fa 100644
--- a/routes/api/v1/authors_add_update.go
+++ b/routes/api/v1/authors_add_update.go
@@ -41,7 +41,7 @@ func AuthorAddOrUpdate(c echo.Context) error {
 		authorID, err := strconv.ParseInt(id, 10, 64)
 
 		if err != nil {
-			return c.JSON(http.StatusInternalServerError, models.Message{"Could not get book id."})
+			return c.JSON(http.StatusBadRequest, models.Message{"Invalid ID."})
 		}
 		datAuthor.ID = authorID
 	}
diff --git a/routes/api/v1/books_add_update.go b/routes/api/v1/books_add_update.go
index 9233e8f..fd27a65 100644
--- a/routes/api/v1/books_add_update.go
+++ b/routes/api/v1/books_add_update.go
@@ -36,7 +36,7 @@ func BookAddOrUpdate(c echo.Context) error {
 		bookID, err := strconv.ParseInt(id, 10, 64)
 
 		if err != nil {
-			return c.JSON(http.StatusInternalServerError, models.Message{"Could not get book id."})
+			return c.JSON(http.StatusBadRequest, models.Message{"Invalid ID."})
 		}
 		datBook.ID = bookID
 	}
diff --git a/routes/api/v1/items_add_update.go b/routes/api/v1/items_add_update.go
index 6fbb927..54e6c9e 100644
--- a/routes/api/v1/items_add_update.go
+++ b/routes/api/v1/items_add_update.go
@@ -36,7 +36,7 @@ func ItemAddOrUpdate(c echo.Context) error {
 		itemID, err := strconv.ParseInt(id, 10, 64)
 
 		if err != nil {
-			return c.JSON(http.StatusInternalServerError, models.Message{"Could not get item ID."})
+			return c.JSON(http.StatusBadRequest, models.Message{"Invalid ID."})
 		}
 		datItem.ID = itemID
 	}
diff --git a/routes/api/v1/publishers_add_update.go b/routes/api/v1/publishers_add_update.go
index db3d2fe..8fd4656 100644
--- a/routes/api/v1/publishers_add_update.go
+++ b/routes/api/v1/publishers_add_update.go
@@ -37,7 +37,7 @@ func PublisherAddOrUpdate(c echo.Context) error {
 		publisherID, err := strconv.ParseInt(id, 10, 64)
 
 		if err != nil {
-			return c.JSON(http.StatusInternalServerError, models.Message{"Could not get item id."})
+			return c.JSON(http.StatusBadRequest, models.Message{"Invalid ID."})
 		}
 		datPublisher.ID = publisherID
 	}
diff --git a/routes/api/v1/user_add_update.go b/routes/api/v1/user_add_update.go
index 81aa9d9..0a99700 100644
--- a/routes/api/v1/user_add_update.go
+++ b/routes/api/v1/user_add_update.go
@@ -43,7 +43,7 @@ func UserAddOrUpdate(c echo.Context) error {
 		userID, err := strconv.ParseInt(id, 10, 64)
 
 		if err != nil {
-			return c.JSON(http.StatusInternalServerError, models.Message{"Could not get item id."})
+			return c.JSON(http.StatusBadRequest, models.Message{"Invalid ID."})
 		}
 		datUser.ID = userID
 	}