`find_jar` function doesn't see input name

The line

find_jar(BIOFORMATS_JAR "bioformats_package")

yields the error message:

CMake Error at /usr/local/Cellar/cmake/3.13.2/share/cmake/Modules/UseJava.cmake:968 (message):
  find_jar: No name to search for given

Changing line number 906:

if (${_state} STREQUAL "name")

to

if ("${_state}" STREQUAL "name")

or to

if (_state STREQUAL "name")

solves this issue.

It seems that ${_state} is evaluated to name, and then the if statement takes name as a variable name because it's not quoted. There is a variable name in scope, but it's defined as the empty string. If I add the lines

if(DEFINED name)
   message("name defined!!!")
endif()

just before the if statement, I get the output

name defined!!!

The only variable name I can find in any of my CMake scripts is used as an input argument to a function. I didn't think that would be visible outside the function?

(I'm running CMake 3.13.2 on MacOS installed through Homebrew.)