This issue may occur if you have more than one copy of a QuickTime component found in different folder locations such as in:
Note: The "~" represents your Home folder.
To resolve this issue, delete the extra copy of the component file in the user-specific folder and not from the system-wide folder.
Some examples of QuickTime component files found to cause iTunes for Mac to quit unexpectedly are:
- /Library/QuickTime/Sonix SN9C201 WebCam.component
- ~/Library/QuickTime/Sonix SN9C201 WebCam.component
Delete the duplicated component file from the user-specific QuickTime folder (~/Library/QuickTime/...)