SQL Syntax error (SQLSTATE[42000]) with command campaignsGet when setting value to limit or offset parameters

`{
  "status": "error",
  "type": "Error",
  "data": {
    "code": "42000",
    "message": "SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''5' OFFSET 0' at line 1"
  }
}`
Similar issue to #30 
