There is a corrupt data in plugin store.
If you do not care about any of the custom data you saved in data explorer try:
./launcher enter app
rails c
PluginStore.where(plugin_name: 'discourse-data-explorer').delete_all
There is a corrupt data in plugin store.
If you do not care about any of the custom data you saved in data explorer try:
./launcher enter app
rails c
PluginStore.where(plugin_name: 'discourse-data-explorer').delete_all