There are at least two approaches that you can take in this situation:
(1) Use "cell mode". Use a conditional breakpoint to stop the code just before it hits the bad iteration. Then, enclose the failing part of the code in a cell (surrounding by "%%" before and after), and you can execute only the failing part. When it crashes, it will not take you completely out of the program.
(2) Save the workspace, and start from there each time. Again, use a conditional breakpoint to stop just before the bad iteration. Save the workspace. Then, instead of running the code for the first 200 iterations, just load the workspace, and run the rest of the code from there.
