Objective-C - unidentified Error in for Loop - iphone

Question

the following code attempts to search for a String given by a cell.textlabel.text in a CSV-File
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//create singleton instance
Globals *myGlobals = [Globals sharedGlobals];
//get searchstring form cell
NSString *stringToFind = [self.tableView cellForRowAtIndexPath:indexPath].textLabel.text;
//get Path of csv and write data in string:allLines
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"ITILcsv" ofType:#"txt"];
if(filePath){
NSString *wholeCSV = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
NSArray *allLines = [wholeCSV componentsSeparatedByString:#"\n"];
//declaration
NSArray *currentArray = nil;
NSString *currentSearchString = nil;
//look for searchstring in 4th line of csv, if found write whole line to a singleton-variable
for (int i=0 ; i < [allLines count]; i++){
currentArray = [[allLines objectAtIndex:i] componentsSeparatedByString:#";"];
currentSearchString = [currentArray objectAtIndex:3];
if ([stringToFind isEqualToString:currentSearchString]){
[myGlobals setCurrentLine:currentArray];
}
}
}
Working quite a bit with csv-files in my current project I'm pretty sure this should work, but somehow the app always crashes when the function is called.
Through a whole bunch of testing I'm pretty sure that the problem is in the following lines:
currentArray = [[allLines objectAtIndex:i] componentsSeparatedByString:#";"];
currentSearchString = [currentArray objectAtIndex:3];
The program works with these two lines commented out, but doesnt implement the desired function ;)
I have no clue what the problem might be?
The Error is a SIGABRT in "main".
Thanks in advance everybody.

Answer 1

Might crash when your currentArray has elements less than 3 and you are referring index 3. So in that case your finding for an index which is out of reach.
So better approach would be
for (int i=0 ; i < [allLines count]; i++)
{
currentArray = [[allLines objectAtIndex:i] componentsSeparatedByString:#";"];
// check and then pick
if ([currentArray count] > 3)
{
currentSearchString = [currentArray objectAtIndex:3];
if ([stringToFind isEqualToString:currentSearchString])
{
[myGlobals setCurrentLine:currentArray];
}
}
}