Repeatable by trying to update existing addons or adding new ones.
Log output of /storage/.kodi/temp/kodi.log
Code
2019-04-11 16:30:30.912 T:3011667280 ERROR: installaddon called with invalid number of parameters (should be: 1, is 0)
2019-04-11 16:30:31.901 T:2650223472 ERROR: CCurlFile::FillBuffer - Failed: SSL peer certificate or SSH remote key was not OK(60)
2019-04-11 16:30:31.901 T:2650223472 ERROR: CCurlFile::Open failed with code 0 for https://addons.libreelec.tv/9.1.900/RPi4/arm/addons.xml.gz.sha256:
2019-04-11 16:30:31.901 T:2650223472 ERROR: Open - failed to open source <https://addons.libreelec.tv/9.1.900/RPi4/arm/addons.xml.gz.sha256>
2019-04-11 16:30:31.901 T:2650223472 ERROR: CRepository: failed read 'https://addons.libreelec.tv/9.1.900/RPi4/arm/addons.xml.gz.sha256'
2019-04-11 16:30:37.619 T:2873164656 ERROR: CCurlFile::FillBuffer - Failed: SSL peer certificate or SSH remote key was not OK(60)
2019-04-11 16:30:37.619 T:2873164656 ERROR: CCurlFile::Open failed with code 0 for https://mirrors.kodi.tv/addons/leia/metadata.tvshows.themoviedb.org/metadata.tvshows.themoviedb.org-3.1.1.zip:
2019-04-11 16:30:37.619 T:2873164656 ERROR: Could not fetch addon location and hash from https://mirrors.kodi.tv/addons/leia/metadata.tvshows.themoviedb.org/metadata.tvshows.themoviedb.org-3.1.1.zip
2019-04-11 16:30:37.619 T:2873164656 ERROR: CAddonInstallJob[metadata.tvshows.themoviedb.org]: failed to resolve addon install source path
2019-04-11 16:30:37.622 T:2864771952 ERROR: CCurlFile::FillBuffer - Failed: SSL peer certificate or SSH remote key was not OK(60)
2019-04-11 16:30:37.622 T:2864771952 ERROR: CCurlFile::Open failed with code 0 for https://mirrors.kodi.tv/addons/leia/metadata.album.universal/metadata.album.universal-3.1.2.zip:
2019-04-11 16:30:37.622 T:2864771952 ERROR: Could not fetch addon location and hash from https://mirrors.kodi.tv/addons/leia/metadata.album.universal/metadata.album.universal-3.1.2.zip
2019-04-11 16:30:37.622 T:2864771952 ERROR: CAddonInstallJob[metadata.album.universal]: failed to resolve addon install source path
2019-04-11 16:30:37.628 T:2658616176 ERROR: CCurlFile::FillBuffer - Failed: SSL peer certificate or SSH remote key was not OK(60)
2019-04-11 16:30:37.628 T:2658616176 ERROR: CCurlFile::Open failed with code 0 for https://mirrors.kodi.tv/addons/leia/metadata.artists.universal/metadata.artists.universal-4.3.2.zip:
2019-04-11 16:30:37.628 T:2658616176 ERROR: Could not fetch addon location and hash from https://mirrors.kodi.tv/addons/leia/metadata.artists.universal/metadata.artists.universal-4.3.2.zip
2019-04-11 16:30:37.629 T:2658616176 ERROR: CAddonInstallJob[metadata.artists.universal]: failed to resolve addon install source pathThanks in advance!