Strange red line due to mapping co-ordinate node?

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1

Hi, I am using a blood-stain image on top of a wall tile texture. This weird red-line appears on the wall when I check the ‘Min’ and ‘Max’ options on the mapping node? Any ideas why?

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2

Check your image has only transparent pixels on all edges

3

Thank you Richard Marklew! Seems to have fixed the issue. Much appreciated!