Just before we escalate this further, this crash doesn't happen on my system. Sometimes the search all cache becomes corrupt and needs to be rebuilt. To do this, go to Preferences (In the Accordance Menu) and the "Reading/Search all" tab.
Towards the bottom there is a button that says "rebuild search all cache".
Click this, press OK.
Quit Accordance and restart (strictly this step should not be necessary).
Then try your search again. It will take longer because it needs to rebuild the data, but let us know if it still crashes.
BTW - why have you used = before your search? Seems redundant to me. What are you trying to search for exactly?