For future people having trouble finding out where this warning comes from: open KismetMathLibrary.cpp in Visual Studio, search for the appropriate text (such as “Divide by zero: Divide_DoubleDouble”), put a breakpoint there and start the editor with debugger attached. Once it hits the break point, go up 2 levels in the call stack and under Locals → Stack, you’ll see what is the offending function.
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