Removing factor column from SpatVector causes segfault

[brownag]

R crashes when removing a factor column from a SpatVector.

I get the following with terra 1.6.51 as well as 1.6.47 from CRAN:

library(terra)
#> terra 1.6.51
x1 <- vect(data.frame(a = "A", lon = 1, lat = 2))
x2 <- vect(data.frame(a = as.factor("A"), lon = 1, lat = 2))

# works
x1[["a"]] <- NULL

# crashes R
x2[["a"]] <- NULL

Traceback:

 *** caught segfault ***
address 0xffffffffffffffe0, cause 'memory not mapped'

Traceback:
 1: .External(list(name = "CppMethod__invoke_notvoid", address = <pointer: 0x558247d30c20>,     dll = list(name = "Rcpp", path = "/home/andrew/R/x86_64-pc-linux-gnu-library/4.2/Rcpp/libs/Rcpp.so",         dynamicLookup = TRUE, handle = <pointer: 0x558247dcc150>,         info = <pointer: 0x558246d52df0>), numParameters = -1L),     <pointer: 0x55824b3143f0>, <pointer: 0x558245f103d0>, .pointer,     ...)
 2: x@ptr$remove_column(name)
 3: .local(x, i, ..., value)
 4: `[[<-`(`*tmp*`, "a", value = NULL)
 5: `[[<-`(`*tmp*`, "a", value = NULL)

[rhijmans]

Ugly! Fixed now. Thanks.