"npm ERR! peer dep missing: ajv@^6.0.0, required by ajv-keywords@3.2.0"

[garyking]

After installing with npm -g i nba-go, I get the following whenever I run npm list --global --depth=0, at the bottom of the list (the message appears twice):

npm ERR! peer dep missing: ajv@^6.0.0, required by ajv-keywords@3.2.0
npm ERR! peer dep missing: ajv@^6.0.0, required by ajv-keywords@3.2.0

Can this module please resolve this? Even running npm -g i ajv doesn't resolve this for me.