### JabRef version 5.12 (latest release) ### Operating system macOS ### Details on version and operating system Sonoma 14.2.1 ### Checked with the latest development build (copy version output from About dialog) - [X] I made a backup of my libraries before testing the latest development version. - [X] I have tested the latest development version and the problem persists ### Steps to reproduce the behaviour 1. Open JabRef 2. Do not create or open a library 3. Press cmd + w (ctrl + w) or File -> Close library <img width="236" alt="Screenshot 2024-02-29 at 11 45 44" src="https://github.com/JabRef/jabref/assets/91327170/7b375c48-7ae9-403f-984a-4b2e4ff4c659"> ### Appendix <img width="1278" alt="Screenshot 2024-02-29 at 11 46 00" src="https://github.com/JabRef/jabref/assets/91327170/d2fbc988-3aa8-44c4-98c8-b78b6fa8f44d"> <details> <summary>Log File</summary> ``` ERROR: Uncaught exception occurred in Thread[#29,JavaFX Application Thread,5,system]: java.lang.NullPointerException: Cannot invoke "org.jabref.gui.LibraryTab.requestClose()" because "libraryTab" is null ``` </details>
JabRef version
5.12 (latest release)
Operating system
macOS
Details on version and operating system
Sonoma 14.2.1
Checked with the latest development build (copy version output from About dialog)
Steps to reproduce the behaviour
Appendix
Log File