SqLite problem

Hello.

Sometimes server crashed with message:

Code:

>who
02:45:50 [SEVERE] java.sql.SQLException: [SQLITE_BUSY]  The database file is locked (database is locked)
02:45:50 [SEVERE]       at org.sqlite.DB.newSQLException(DB.java:383)
02:45:50 [SEVERE]       at org.sqlite.DB.newSQLException(DB.java:387)
02:45:50 [SEVERE]       at org.sqlite.DB.execute(DB.java:339)
02:45:50 [SEVERE]       at org.sqlite.PrepStmt.executeQuery(PrepStmt.java:75)
02:45:50 [SEVERE]       at com.griefcraft.sql.PhysDB.resolveProtections(PhysDB.java:461)
02:45:50 [SEVERE]       at com.griefcraft.sql.PhysDB.loadProtections(PhysDB.java:707)
02:45:50 [SEVERE]       at com.griefcraft.modules.flag.MagnetModule$MagnetTask.run(MagnetModule.java:116)
02:45:50 [SEVERE]       at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:137)
02:45:50 [SEVERE]       at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:438)
02:45:50 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)
02:45:50 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

I move all plugins to MySQL, but i can't do it for LWC.
Question — how unlock database file?
Also, i google it, but nothing intersting found.