How are you generating the cracks currently? The way you're thinking about this is backwards. In Designer it's bad practice to go back and fix your noise/patterns with other nodes. It is better to find out why something is occurring and edit those settings earlier in the chain. From what little information I have it looks like those cracks are generated from the environment toolkit node.
Within that node there should be a setting for crack size, turn that up and it will fix the issue. Or an easier way is to simply change the random seed on the node generating the error and find a seed that doesn't make that error.
Don't really understand why that particular line is an issue though, it should just come across in the material as hairline fracture and be super subtle. As well as all the other lines that are doing the same thing throughout image.
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