First, update your software. You are 100 versions behind.
Second, if you had searched the forum before posting, you could have discovered this is a known bug that affects some—but only some—Mac installations, primarily with older versions of the macOS. The developer is awaiting action by a third-party developer of software bundled with Manager. See Crash when creating pdf on Mac after installing Ver 21.1.23.
Meanwhile, right-click on any hyperlink in the Manager window and select “Open Link in New Window” to open a second instance of Manager in a browser. You should be able to perform all functions there, with data being saved to your regular data file.