Ignoring #VALUE! Entries

I am having difficulty devising a formula syntax that will ignore including #VALUE! entries. See attached file.

To illustrate, I have placed -1 values in several cells Column B. This allows the formulas in Columns S and T to work. However, as soon as you put a value of zero in column B, all entries in Column S and T become #VALUE

If Column Q displays #VALUE!, it is because it is feeding off a “0" entry in Column B. Change a zero amount in column B to a positive or negative integer and the Q cells populates correctly.

Is there a way to restructure formulas in Columns S and T to allow for “0" entry in Column B?

Thanks!!