Prevent uninstall error on install error

server/lib/plugins/plugin-manager.ts

@@ -370,6 +370,7 @@ export class PluginManager implements ServerHook {
     } catch (rootErr) {
       logger.error('Cannot install plugin %s, removing it...', toInstall, { err: rootErr })
 
+      if (npmName) {
         try {
           await this.uninstall({ npmName })
         } catch (err) {
@@ -381,6 +382,7 @@ export class PluginManager implements ServerHook {
             logger.error('Cannot remove plugin %s after failed installation.', toInstall, { err })
           }
         }
+      }
 
       throw rootErr
     }