Error in if (out == "[]") { : argument is of length zero

[morculture]

options(ieugwasr_api = 'gwas-api.mrcieu.ac.uk/')
exp_data <- extract_instruments(outcomes = dat$GWAS ID[i],

•                                   p1=pvalue,
  

•                                   clump = FALSE)
  

Error in if (out == "[]") { : argument is of length zero

traceback()
2: ieugwasr::tophits(outcomes, pval = p1, clump = clump, r2 = r2,
kb = kb, force_server = FALSE, opengwas_jwt = opengwas_jwt)
1: extract_instruments(outcomes = dat$GWAS ID[i], p1 = pvalue,
clump = FALSE)

[ManqiZh]

Many GWAS IDs are experiencing the same problem.
By trying to modify the pval parameter, I found out that the probable reason for this error is that no matching SNPs were filtered.