GPX export doesn't work more than a certain number of route points

I'm not sure whether this is the right place to seek for a solution but I haven't found any other place. The problem is that it isn't possible to export directions as GPX. I click the button and get the message "Failed to export the current route". The inspector shows a "500"-error but "apache2"-s error log doesn't show any specific error, only some authentication stuff: "[authz_core:debug] [pid 27895] mod_authz_core.c(809): [client 192.168.1.65:44444] AH01626: authorization result of : granted". In the inspector, I see that something will be posted to https://nextcloud.tennis24.ee/index.php/apps/maps/exportRoute. Part of this something is "coords:

..." OSRM log shows up no errors.

The contents of data/nextcloud.log:

"{"reqId":"afEnn5QKUGZY44IWlZzJ","level":0,"time":"2020-07-07T00:28:42+00:00","remoteAddr":"192.168.1.65","user":"peacecop-kalmer","app":"no app in context","method":"POST","url":"/index.php/apps/maps/exportRoute","message":"Deprecated event type for \OCP\Files::preWrite: Symfony\Component\EventDispatcher\GenericEvent","userAgent":"Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Mobile Safari/537.36","version":"18.0.6.0"}
{"reqId":"afEnn5QKUGZY44IWlZzJ","level":0,"time":"2020-07-07T00:28:42+00:00","remoteAddr":"192.168.1.65","user":"peacecop-kalmer","app":"no app in context","method":"POST","url":"/index.php/apps/maps/exportRoute","message":"Deprecated event type for \OCP\Files::preCreate: Symfony\Component\EventDispatcher\GenericEvent","userAgent":"Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Mobile Safari/537.36","version":"18.0.6.0"}
{"reqId":"afEnn5QKUGZY44IWlZzJ","level":0,"time":"2020-07-07T00:28:42+00:00","remoteAddr":"192.168.1.65","user":"peacecop-kalmer","app":"wopi","method":"POST","url":"/index.php/apps/maps/exportRoute","message":"not a file","userAgent":"Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Mobile Safari/537.36","version":"18.0.6.0"}
{"reqId":"afEnn5QKUGZY44IWlZzJ","level":3,"time":"2020-07-07T00:28:42+00:00","remoteAddr":"192.168.1.65","user":"peacecop-kalmer","app":"index","method":"POST","url":"/index.php/apps/maps/exportRoute","message":{"Exception":"OCP\Files\NotPermittedException","Message":"Could not create path","Code":0,"Trace":[{"file":"/projektid/nextcloud/apps/maps/lib/Controller/RoutingController.php","line":111,"function":"newFile","class":"OC\Files\Node\Folder","type":"->","args":["2020-07-07 03:28:42 (+03:00) Vesiveski tee, Vesiveski tee, Vesiveski tee, Vesiveski tee, , , Vesiveski tee, Vesiveski tee, Pargi allee, , , , , Merenuka, Merenuka, Merenuka, Spordi, Pargi allee, Lossi, Lossi, Kose, Kose, Pohla, Kose, Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, V\u00e4\u00e4na tee, , Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, Pargi allee, Pargi allee, Vesiveski tee, Pargi allee, Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, L\u00f5okese tee, Orava tee, L\u00f5okese tee, Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, , Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, Pargimetsa tee, Pargimetsa tee, Tallinn \u2014 Rannam\u00f5isa \u2014 Kloogaranna, M\u00e4nnim\u00e4e tee, M\u00e4nnim\u00e4e tee, , , , , , , .gpx"]},{"file":"/projektid/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":170,"function":"exportRoute","class":"OCA\Maps\Controller\RoutingController","type":"->","args":[" <rtept lat="59.39462" lon="24.29565">\n \n <rtept lat="59.39473" lon="24.29571">\n \n <rtept lat="59.39481" lon="24.29573">\n \n <rtept lat="59.39489" lon="24.29578">\n \n <rtept lat="59.39523" lon="24.29587">\n \n <rtept lat="59.39523" lon="24.29587">\n \n <rtept lat="59.39525" lon="24.29597">\n \n <rtept lat="59.39527" lon="24.29605">\n \n <rtept lat="59.39527" lon="24.29605">\n \n <rtept lat="59.39525" lon="24.29614">\n \n <rtept lat="59.39524" lon="24.29618">\n \n 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I dug into "apps/maps/lib/Controller/RoutingController.php" and found the place the file is being created. It's around the line 111. I also tested the exporting functionality with less route points and I doubt that the problem is the file name. Now, the file name is being created out of the route parts. The more parts are there the longer is the file name. Until the file name is too long and no human-friendly error message will be reported in that case. I suggest that the file name handling must be reworked so that it won't contain all the parts of the route but so that the use can choose the file name if the name is too long. Or you put there some other automation in order to avoid the unuseful message that export fails. I had a route with 41 points. Try something similar in order to recreate the case!

Start at apps/maps/lib/Controller/RoutingController.php line 111 and the /index.php/apps/maps/exportRoute endpoint. Reproduce the export with a route containing many points, then inspect the reported OCP\Files\NotPermittedException and the request logs. Done means the route exports as a usable GPX file instead of returning HTTP 500.