I think I have the same / a similar problem.
After updating with the web based updater, everything seems to be normal. I could browse my files and all was ok. After logging out, I can’t access my nextcloud anymore. It always says “Internal Server Error”.
Here is what’s in my nextcloud.log:
{"reqId":"XBvCdCjtO2f-1KkNhgffHAAAAAc","level":3,"time":"2018-12-20T16:25:24+00:00","remoteAddr":"93.217.252.114","user":"--","app":"core","method":"GET","url":"\/index.php\/login","message":{"Exception":"RuntimeException","Message":"File entry could not be inserted but could also not be selected with getId() in order to perform an update. Please try again.","Code":0,"Trace":[{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/Cache\/Cache.php","line":232,"function":"insert","class":"OC\\Files\\Cache\\Cache","type":"->","args":["appdata_ocadd7405d0b\/js",{"mimetype":"httpd\/unix-directory","mtime":1495637493,"size":-1,"etag":"5c1bc274c9a75","storage_mtime":1495637493,"permissions":31,"parent":0,"checksum":"","path":"appdata_ocadd7405d0b\/js","name":"js"}]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/Cache\/Scanner.php","line":292,"function":"put","class":"OC\\Files\\Cache\\Cache","type":"->","args":["appdata_ocadd7405d0b\/js",{"mimetype":"httpd\/unix-directory","mtime":1495637493,"size":-1,"etag":"5c1bc274c9a75","storage_mtime":1495637493,"permissions":31,"parent":0,"checksum":""}]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/Cache\/Scanner.php","line":221,"function":"addToCache","class":"OC\\Files\\Cache\\Scanner","type":"->","args":["appdata_ocadd7405d0b\/js",{"mimetype":"httpd\/unix-directory","mtime":1495637493,"size":-1,"etag":"5c1bc274c9a75","storage_mtime":1495637493,"permissions":31,"parent":0,"checksum":""},-1]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/Cache\/Scanner.php","line":336,"function":"scanFile","class":"OC\\Files\\Cache\\Scanner","type":"->","args":["appdata_ocadd7405d0b\/js",3,0,false,true]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/View.php","line":1324,"function":"scan","class":"OC\\Files\\Cache\\Scanner","type":"->","args":["appdata_ocadd7405d0b\/js",false]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/View.php","line":1368,"function":"getCacheEntry","class":"OC\\Files\\View","type":"->","args":[{"cache":{"__class__":"OC\\Files\\Cache\\Cache"},"scanner":{"__class__":"OC\\Files\\Cache\\Scanner"},"watcher":null,"propagator":null,"updater":null,"__class__":"OCA\\Files_Trashbin\\Storage"},"appdata_ocadd7405d0b\/js","\/appdata_ocadd7405d0b\/js"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/Node\/Root.php","line":198,"function":"getFileInfo","class":"OC\\Files\\View","type":"->","args":["\/appdata_ocadd7405d0b\/js"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/Node\/Folder.php","line":133,"function":"get","class":"OC\\Files\\Node\\Root","type":"->","args":["\/appdata_ocadd7405d0b\/js"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/AppData\/AppData.php","line":91,"function":"get","class":"OC\\Files\\Node\\Folder","type":"->","args":["js"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/AppData\/AppData.php","line":107,"function":"getAppDataFolder","class":"OC\\Files\\AppData\\AppData","type":"->","args":[]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Template\/JSCombiner.php","line":94,"function":"getFolder","class":"OC\\Files\\AppData\\AppData","type":"->","args":["core"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Template\/JSResourceLocator.php","line":114,"function":"process","class":"OC\\Template\\JSCombiner","type":"->","args":["\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud","core\/js\/merged-template-prepend.json","core"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Template\/JSResourceLocator.php","line":70,"function":"cacheAndAppendCombineJsonIfExist","class":"OC\\Template\\JSResourceLocator","type":"->","args":["\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud","core\/js\/merged-template-prepend.json"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Template\/ResourceLocator.php","line":78,"function":"doFind","class":"OC\\Template\\JSResourceLocator","type":"->","args":["js\/merged-template-prepend"]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/TemplateLayout.php","line":315,"function":"find","class":"OC\\Template\\ResourceLocator","type":"->","args":[["vendor\/core","js\/merged-template-prepend","search\/js\/search","core\/l10n\/de_DE","core\/js\/merged-share-backend","firstrunwizard\/l10n\/de_DE","firstrunwizard\/js\/jquery.colorbox","firstrunwizard\/js\/firstrunwizard","files_pdfviewer\/l10n\/en","files_pdfviewer\/js\/previewplugin","files_videoplayer\/l10n\/en","files_videoplayer\/js\/viewer","gallery\/l10n\/de_DE","search\/l10n\/de_DE","search\/js\/searchprovider","js\/jquery-ui-fixes","js\/files\/fileinfo","js\/files\/client","js\/contactsmenu","js\/contactsmenu_templates"]]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/TemplateLayout.php","line":154,"function":"findJavascriptFiles","class":"OC\\TemplateLayout","type":"::","args":[["vendor\/core","js\/merged-template-prepend","search\/js\/search","core\/l10n\/de_DE","core\/js\/merged-share-backend","firstrunwizard\/l10n\/de_DE","firstrunwizard\/js\/jquery.colorbox","firstrunwizard\/js\/firstrunwizard","files_pdfviewer\/l10n\/en","files_pdfviewer\/js\/previewplugin","files_videoplayer\/l10n\/en","files_videoplayer\/js\/viewer","gallery\/l10n\/de_DE","search\/l10n\/de_DE","search\/js\/searchprovider","js\/jquery-ui-fixes","js\/files\/fileinfo","js\/files\/client","js\/contactsmenu","js\/contactsmenu_templates"]]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/legacy\/template.php","line":211,"function":"__construct","class":"OC\\TemplateLayout","type":"->","args":["error",""]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Template\/Base.php","line":132,"function":"fetchPage","class":"OC_Template","type":"->","args":[]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/legacy\/template.php","line":360,"function":"printPage","class":"OC\\Template\\Base","type":"->","args":[]},{"file":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/index.php","line":69,"function":"printExceptionErrorPage","class":"OC_Template","type":"::","args":[{"__class__":"RuntimeException"},500]}],"File":"\/www\/htdocs\/w0069a6f\/maincloud\/nextcloud\/lib\/private\/Files\/Cache\/Cache.php","Line":297,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/71.0.3578.98 Safari\/537.36","version":"15.0.0.10"}
Any ideas…?
/edit: It seems that my desktop app can still access my instance… when i start the app, it get’s synced and shows a green checkmark.