From your Safari menu bar click Safari > Preferences then select the Extensions tab,
If there are any extensions installed, turn that OFF then quit and relaunch Safari to test.
If it's not an extension issue, back to Safari > Preferences. This time select the Security tab.
Deselect: Enable plugins
Quit and relaunch Safari.
If Safari doesn't crash, follow the instructions for troubleshooting third party add ons here.