Bug - Full Crash

Full Crash:

App Version: 1.9.7
App Version Code: 1009007
App Flavor: fdroid

Files App Version Code: 30130090

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OS Version: 4.9.31(136)
OS API Level: 25
Device: OnePlus3T
Manufacturer: OnePlus
Model (and Product): ONEPLUS A3010 (OnePlus3)

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java.lang.NullPointerException: Attempt to invoke virtual method 'long java.lang.Long.longValue()' on a null object reference
	at it.niedermann.nextcloud.deck.persistence.sync.helpers.providers.CardDataProvider.createOnServer(CardDataProvider.java:153)
	at it.niedermann.nextcloud.deck.persistence.sync.helpers.providers.CardDataProvider.createOnServer(CardDataProvider.java:28)
	at it.niedermann.nextcloud.deck.persistence.sync.helpers.SyncHelper.doUpSyncFor(SyncHelper.java:101)
	at it.niedermann.nextcloud.deck.persistence.sync.helpers.SyncHelper.doUpSyncFor(SyncHelper.java:85)
	at it.niedermann.nextcloud.deck.persistence.sync.SyncManager.lambda$createFullCard$23$SyncManager(SyncManager.java:1024)
	at it.niedermann.nextcloud.deck.persistence.sync.-$$Lambda$SyncManager$XpxFVJbcKQqo8Y5Ou64QU-ylP-E.run(lambda)
	at java.lang.Thread.run(Thread.java:761)

Please provide a DETAILED step-by-step description how you ran into this problem.

I have inserted a card without internet connection