Cannot convert undefined or null to object

[Ostaer]

I get an error apidoc-markdown -p . -o text.rd undefined:25 throw err; ^

TypeError: ejs:30 28| <%-: data[group][sub][0].type | upcase %> <%= data[group][sub][0].url %> 29| ```

30| 31| <% if (data[group][sub][0].header && data[group][sub][0].header.fields.Header.length) { -%> 32| ### Headers 33| xdl Cannot convert undefined or null to object at Function.keys () at eval (eval at exports.compile (C:\Users\name\AppData\Roaming\npm\node_modules\apidoc-markdown\node_modules\ejs\lib\ejs.js:237:14), :32:114) at Array.forEach () at eval (eval at exports.compile (C:\Users\name\AppData\Roaming\npm\node_modules\apidoc-markdown\node_modules\ejs\lib\ejs.js:237:14), :30:1192) at Array.forEach () at eval (eval at exports.compile (C:\Users\name\AppData\Roaming\npm\node_modules\apidoc-markdown\node_modules\ejs\lib\ejs.js:237:14), :30:964) at eval (eval at exports.compile (C:\Users\name\AppData\Roaming\npm\node_modules\apidoc-markdown\node_modules\ejs\lib\ejs.js:237:14), :46:21) at C:\Users\name\AppData\Roaming\npm\node_modules\apidoc-markdown\node_modules\ejs\lib\ejs.js:250:15 at Object. (C:\Users\name\AppData\Roaming\npm\node_modules\apidoc-markdown\index.js:88:31) at Module._compile (module.js:643:30)