title: Error: invalid input syntax for type integer: "" on express server with postgres backend
body: <p>Hoping some can please assist with the following express server error as unsure what to look for and why this type of error keeps on appearing. It is using a postgres db backend. It seems to also crash the server.</p>
  <pre><code>error: invalid input syntax for type integer: &quot;&quot;
      at Parser.parseErrorMessage (/home/app/server/node_modules/pg-protocol/dist/parser.js:278:15)
      at Parser.handlePacket (/home/app/server/node_modules/pg-protocol/dist/parser.js:126:29)
      at Parser.parse (/home/app/server/node_modules/pg-protocol/dist/parser.js:39:38)
      at Socket.&lt;anonymous&gt; (/home/app/server/node_modules/pg-protocol/dist/index.js:10:42)
      at Socket.emit (events.js:375:28)
      at addChunk (internal/streams/readable.js:290:12)
      at readableAddChunk (internal/streams/readable.js:265:9)
      at Socket.Readable.push (internal/streams/readable.js:204:10)
      at TCP.onStreamRead (internal/stream_base_commons.js:188:23) {
    length: 101,
    severity: 'ERROR',
    code: '22P02',
    detail: undefined,
    hint: undefined,
    position: undefined,
    internalPosition: undefined,
    internalQuery: undefined,
    where: undefined,
    schema: undefined,
    table: undefined,
    column: undefined,
    dataType: undefined,
    constraint: undefined,
    file: 'numutils.c',
    line: '323',
    routine: 'pg_strtoint32'
  }
  </code></pre>
  <p>Is there something specific I need to look for based on this <code>error: invalid input syntax for type integer</code> ?</p>
  <p><strong><strong>UPDATED</strong></strong> - based on below comment, could the following insert query possibly cause this error?</p>
  <pre><code>const insertLogQuery = `
  insert into log (log_id, run_id, s_id, q_id, message)
       values ($1, $2, $3, $4, $5)          
  `;
  const insertLog = await pool.query(insertLogQuery, [ id, null, null, null, reason ]);
  </code></pre>
  <p>where the columns: <code>run_id</code>, <code>s_id</code> and <code>q_id</code> are defined as integers.</p>
  <p>If so, can someone pls let me know what the best approach is to prevent this error based on this code.</p>