Failed to run openapi-cop TypeError: Cannot read property 'constructor' of null

[walles]

Starting revision 5cb4e9f (from PR #404) in Docker (compose) I get the below output.

Note also that it exited with code 0 which is weird considering it didn't work.

Environment

DEFAULT_FORBID_ADDITIONAL_PROPERTIES=true
VERBOSE=true
TARGET=http://xxxxxx:5058
FILE=/api.yaml

api.yaml

Proprietary, sorry, can't post it.

Output

Note how everything here is .js and the line numbers not matching the .ts source code.

pfcapi-openapi-cop-1            | Validating against api.yaml ("PFC API", version: 1.0.0)
pfcapi-openapi-cop-1            | Additional properties will be forbidden by default. Existing `additionalProperties` settings in the OpenAPI document will NOT be overwritten.
pfcapi-openapi-cop-1            | Failed to run openapi-cop TypeError: Cannot read property 'constructor' of null
pfcapi-openapi-cop-1            |     at mapWalkObject (/openapi-cop-docker/src/util.js:209:19)
pfcapi-openapi-cop-1            |     at mapWalkObject (/openapi-cop-docker/src/util.js:210:28)
pfcapi-openapi-cop-1            |     at mapWalkObject (/openapi-cop-docker/src/util.js:210:28)
pfcapi-openapi-cop-1            |     at mapWalkObject (/openapi-cop-docker/src/util.js:210:28)
pfcapi-openapi-cop-1            |     at mapWalkObject (/openapi-cop-docker/src/util.js:210:28)
pfcapi-openapi-cop-1            |     at Object.mapWalkObject (/openapi-cop-docker/src/util.js:210:28)
pfcapi-openapi-cop-1            |     at prepareApiDocument (/openapi-cop-docker/src/app.js:184:21)
pfcapi-openapi-cop-1            |     at process._tickCallback (internal/process/next_tick.js:68:7)
pfcapi-openapi-cop-1            |     at Function.Module.runMain (internal/modules/cjs/loader.js:834:11)
pfcapi-openapi-cop-1            |     at startup (internal/bootstrap/node.js:283:19)
pfcapi-openapi-cop-1            |     at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
pfcapi-openapi-cop-1 exited with code 0

[pemcampos]

That happens when you have examples with null values.
In the function mapWalkObject just replace:
const value = obj[key];
with:
const value = obj[key]; if(!value) continue;
for a quick fix