XCode调试的时候报错Terminating app due to uncaught

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[2]'
*** First throw call stack:

attempt to insert nil object from objects[2]，得针对代码去看

向字典中插入空数据时会报这个错