It seems that the cause of the issue is not data corruption after all. Then, it may be a temporary or isolated malfunction of one of our apps.
The best way to fix that is by uninstalling Dashlane and then reinstalling it.

On mobile devices, tap and hold your finger on the Dashlane app icon and uninstall the app. Then, install it again from the App Store, for iOS, or the Google Play Store, for Android.
On a computer, right-click the Dashlane D icon on your browser and select the Remove option. Then, install it again from https://www.dashlane.com/download. If you're using the Safari app, follow these instructions. Be sure to rule out extension conflict as described in this FAQ.

After reinstalling Dashlane and making sure your browser is up-to-date with cache and cookies cleared, please try to log in again.

I can’t log in to my Dashlane account, I forgot my Master Password