EXEC_BAD_ACCESS on becomeFirstResponder call - iphone

Question

I have created a keyboard with some arrow keys that allows the user to navigate with arrow buttons, between all the text fields in the tableview. (2 per cell)
There are some situations where cells will be disabled, so I have a recursive call to skip them. ie. if the user presses the right arrow, and the textField is disabled, recursively call the right arrow again to skip it.
I also animate any scrolling that needs to be done myself. However, something has happened recently that is causing a EXEC_BAD_ACCESS when trying to set the firstResponder after a user navigates to a new textField, and the scrolling animation is finished.
I am able to reproduce this issue starting in the first cell and navigating down 2 times. Here is the code, in order of what is happening as best as I can display it, with a lot edited (like all the code for the other 3 arrow buttons so u only see the lines called)
//receive the arrow button pressed first
_arrowButton = arrowButton;
#try
{
switch (_arrowButton.tag)
{
case NumericKeyboardViewDownArrow:
destinationIndexPath = [NSIndexPath indexPathForRow:currentIndexPath.row + 1 inSection:currentIndexPath.section];
newTag = currentTextField.tag;
break;
default:
break;
}
// check bounds of the intended index path and return if out of bounds
if ((destinationIndexPath.row == -1) || (destinationIndexPath.row >= [_tableView numberOfRowsInSection:[destinationIndexPath section]])) {
destinationIndexPath = currentIndexPath;
return;
}
/*
Animation for scrolling
*/
CGPoint current = [_tableView contentOffset];
// if we must animate up
if (destinationIndexPath.row < currentIndexPath.row)
{
// up code here
}
// if we must animate down
else if (destinationIndexPath.row > currentIndexPath.row)
{
// always scroll animate for down
[_tableView setContentOffset:CGPointMake(0, current.y + _tableView.rowHeight) animated:YES];
}
// if we only move left or right
else
{
// left and right code here
}
//update our current location
currentIndexPath = destinationIndexPath;
#catch (NSException *e)
{
return;
}
then after the animation is finished in the did finish animating method
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
{
//after the animation is done, set the responder
nextTextFieldSelection = (UITextField *)[[_tableView cellForRowAtIndexPath:currentIndexPath] viewWithTag:newTag];
NSLog(#"nexttextfield%#",nextTextFieldSelection);
if (nextTextFieldSelection)
{
//CRASH OCCURS HERE [nextTextFieldSelection becomeFirstResponder];
}
[self checkTextFieldIsDisabled];
}
By the end of that method I am in a new text field and we check if disabled. In reproducing this crash, it just exits because the textFields I am moving in to are not disabled.
Ive tried resigning the first responder before calling a new becomeFirstResponder but that doesn't seem to have any effect. Its possible I wasn't resigning in the proper location though. Any ideas where the memory issue would be?
Thanks