Ugly shape around sprite after changing to shader material

Questions & Answers
1

I’m trying to use shaders, but I have an issue each time - an ugly shape around the sprite when I change the material from default. 179889-game-view.png

2

So if any one has the same problem form me have helped an extra SAMPLE TEXTURE 2D pointed to ALPHA value (sorry for my English).

180005-fix.png
180005-fix.png722×731 47.5 KB