- No need for panic, just stop play mode, wait and start again.
- Before playing any scene make sure you save the scene.
- Wait for a few seconds after you press the play button.
- The changes made during the play mode are not saved, while making any changes check that if you aren't in play mode.
- If that happens stop to modify code unless you know you can write correct code before saving. when you create an error and the code is passed through it will lead to an error if you are lucky and to an exception otherwise and cease the execution of the whole code block following.
- Can happen yes if it causes an exception that you didn't catch.
While playing the game First save by ctrl + s (for windows) or cmd + s (for mac) the game then wait for 2-5 sec then hit play it will load the game play without crash in unity.