Type of bug

Error in console, Other unexpected behaviour

Error log (if applicable)

No response

Bug description

When I first time add the plugin to my server, every time i right clicked on the old wolf, it updates to the new wolf. But when I restart the server, the old wolfs no longer update.

Steps to reproduce

1. Download the plugin and launch the server.
2. Update some old wolves
3. Restart the server.

Expected behaviour

Old wolves update to new wolves

Actual behaviour

Old wolves don't update to new wolves

Forgot to mention:
every second, the console show this:
[02:38:23 WARN]: [MyDog] Task #9 for MyDog v0.2.1 generated an exception
java.lang.NullPointerException: Cannot invoke "String.length()" because "text" is null
at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1474) ~[?:?]
at java.text.DateFormat.parse(DateFormat.java:397) ~[?:?]
at dk.fido2603.mydog.objects.Dog.getBirthday(Dog.java:166) ~[mydog-0.2.1.jar:?]
at dk.fido2603.mydog.objects.Dog.(Dog.java:101) ~[mydog-0.2.1.jar:?]
at dk.fido2603.mydog.managers.DogManager.getDogs(DogManager.java:194) ~[mydog-0.2.1.jar:?]
at dk.fido2603.mydog.managers.DogManager.getAliveDogs(DogManager.java:203) ~[mydog-0.2.1.jar:?]
at dk.fido2603.mydog.tasks.AttackModeTask.run(AttackModeTask.java:20) ~[mydog-0.2.1.jar:?]
at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftTask.run(CraftTask.java:101) ~[paper-1.19.4.jar:git-Paper-538]
at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[paper-1.19.4.jar:git-Paper-538]
at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1483) ~[paper-1.19.4.jar:git-Paper-538]
at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:447) ~[paper-1.19.4.jar:git-Paper-538]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1397) ~[paper-1.19.4.jar:git-Paper-538]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1174) ~[paper-1.19.4.jar:git-Paper-538]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:320) ~[paper-1.19.4.jar:git-Paper-538]
at java.lang.Thread.run(Thread.java:833) ~[?:?]

Forgot to mention again. When i delete both config folder and jar file and redownload the plugin, the old wolves updates again.

Thanks for the bug report, I'll take a look into it!

I fixed the console error, but I need more info for the rest, with the old wolves not updating?
It works fine on my end when testing, so if possible, I would like some more information on this.

The issue might auto-close because I fixed the other thing, but feel free to reopen the issue!