Do not graph negative numbers

Hi all,
What is the best way to remove negative values from a line graph? All the data should be positive but I have a few negative values that are not real data points so I don't want to graph them. I'd rather not replace them with 0's I'd prefer to just have a missing data point. all the negatives are the same number (-7999). While the rest of the graph is in the range of 1500-2200.

I would be tempted to manually format the y axis minimum to 0. I guess this technically means the -7999 is still plotted, but it is plotted "off scale" where I can't see it.