Segmentation fault in the below program - raku

Question

The below code is being called from a simple script like this.
$test.line-validation();
method line-validation is rw {
my $file-data = slurp($!FileName, enc => "iso-8859-1");
my #lines = $file-data.lines;
my $start = now;
for #lines -> $line {
state $i = 1;
my #splitLine = split('|', $line);
if ($line.starts-with("H|") || $line.starts-with("T|")) {
next;
}
my $lnObject = LineValidation.new( line => $line, FileType => $.FileType );
$lnObject.ColumnIds = %.ColumnIds;
my #promises;
my #validationIds;
for %.ValidationRules.keys -> $validationId {
if (%.ValidationRules{$validationId}<ValidationType> eq 'COLUMN') {
push #promises, start {$lnObject.ColumnValidationFunction(%.ValidationRules{$validationId}<ValidationFunction>, %.ValidationRules{$validationId}<Arguments>, $.ValidationRules{$validationId}<Description>); 1};
push #validationIds, $validationId;
}
}
my #promise-output = await #promises;
for #validationIds -> $valId {
state $j = 0;
my $result = #promise-output[$j];
if ($result.Bool == True) {
if (%.ResultSet{$valId}<count> :!exists) {
%.ResultSet{$valId}<count> = 1;
} else {
%.ResultSet{$valId}<count> = %.ResultSet{$valId}<count> + 1;
}
my #prCol = (%.ValidationRules{$valId}<Arguments><column>, #.printColumns);
if (%.ResultSet{$valId}<count> <= 10) {
%.ResultSet{$valId}.push: (sample => join('|', #splitLine[#prCol[*;*]].map: { if ($_.Bool == False ) { $_ = ''} else {$_ = $_;} }));
}
%.ResultSet{$valId}<ColumnList> = #prCol[*;*];
}
$j++;
}
$i++;
}
say "Line validation completed in {now - $start } time for $.lineCount lines";
}
The code was working fine earlier but when run using larger files, it just arbitrarily throws the error Segmentation fault and exists. I cannot determine where it is failing either.