Update SQL.java

Author: intisy

src/main/java/io/github/intisy/utils/custom/SQL.java

@@ -254,7 +254,7 @@ public void insertDataIfEmpty(String tableName, Object... columnsAndValues) {
 
     private boolean isInvalidIdentifier(Object[] identifier) {
         for (Object object : identifier)
-            if (isInvalidIdentifier(object)) {
+            if (isInvalidIdentifier(object.toString())) {
                 return true;
             }
         return false;