ID:13614 VHDL warning at <location>: ignored assignment of value to null range

CAUSE: In a VHDL Design File (.vhd) at the specified location, you assigned a value to a null range. Because you cannot make an assignment to a null range, the Quartus Prime software ignored the assignment.

ACTION: Make sure the range should be a null range. If the range is intended to be a null range, and you want to avoid receiving this message in the future, remove the assignment to the null range.