Problem on upgrading 1.7.3: semver problem

[jiangcaiyang]

Hello, long time no visit this site. Recently I updated my forum to 1.7.3, but gets error on ./nodebb upgrade. Here is the output:

/node_modules/semver/semver.js:293
    throw new TypeError('Invalid Version: ' + version);
    ^

TypeError: Invalid Version: upgrades

more sensitive data omitted

It seems the new version of code has problem.