panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x4e57cd]
goroutine 1 [running]:
github.com/arch-mage/mdb.(*iterator).next(0x666df0?)
/home/luoooo/go/pkg/mod/github.com/arch-mage/mdb@v0.0.3/data.go:22 +0x2d
github.com/arch-mage/mdb.readCatalog({0x666df0, 0xc000014678})
/home/luoooo/go/pkg/mod/github.com/arch-mage/mdb@v0.0.3/catalog.go:23 +0xc5
github.com/arch-mage/mdb.Tables({0x666df0, 0xc000014678})
/home/luoooo/go/pkg/mod/github.com/arch-mage/mdb@v0.0.3/mdb.go:77 +0x3e
github.com/luo-geng/mdb_gpkg/db/mdb.Read({0x637acb?, 0xc0000061a0?})
