diff --git a/internal/handlers/koreader.go b/internal/handlers/koreader.go
index c4db8f9..1f721f0 100644
--- a/internal/handlers/koreader.go
+++ b/internal/handlers/koreader.go
@@ -4,6 +4,7 @@ import (
 	"bookhoard/internal/database"
 	wsync "bookhoard/internal/sync"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"time"
@@ -401,11 +402,11 @@ func (h *KOReaderHandler) updateProgressForBook(c *echo.Context, userID pgtype.U
 		UserID:      userID,
 	})
 
-	if err != nil && err != pgx.ErrNoRows {
+	if err != nil && !errors.Is(err, pgx.ErrNoRows) {
 		return err
 	}
 
-	hasExistingProgress := err != pgx.ErrNoRows
+	hasExistingProgress := !errors.Is(err, pgx.ErrNoRows)
 	conflictDetected := false
 
 	if hasExistingProgress && existingProgress.LastSyncSource.Valid {