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/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:555
        rightSource = toSourceNodeWhenNeeded(right).toString();
                                                   ^

TypeError: Cannot read property 'toString' of undefined
    at join (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:555:52)
    at CodeGenerator.BinaryExpression (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:1854:26)
    at CodeGenerator.generateExpression (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:2456:28)
    at CodeGenerator.CallExpression (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:1880:34)
    at CodeGenerator.generateExpression (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:2456:28)
    at CodeGenerator.ExpressionStatement (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:1335:28)
    at CodeGenerator.generateStatement (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:2469:33)
    at CodeGenerator.Program (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:1717:43)
    at CodeGenerator.generateStatement (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:2469:33)
    at generateInternal (/home/chris/dev/node/jsmutate/node_modules/escodegen/escodegen.js:2490:28)