S3 Object Lambda Function v4signature error

I am calling "WriteGetObjectResponseCommand" from a S3 object lambda function - there shouldn't be a need to manually set credentials within the event handler - and getting an error related to SignatureV4: Error TypeError: Cannot read property 'trim' of undefined at Object.getCanonicalHeaders (/opt/nodejs/node_modules/@aws-sdk/signature-v4/dist-cjs/getCanonicalHeaders.js:17:62) at SignatureV4.signRequest (/opt/nodejs/node_modules/@aws-sdk/signature-v4/dist-cjs/SignatureV4.js:97:56) at async StandardRetryStrategy.retry (/opt/nodejs/node_modules/@aws-sdk/middleware-retry/dist-cjs/StandardRetryStrategy.js:51:46) at async /opt/nodejs/node_modules/@aws-sdk/middleware-logger/dist-cjs/loggerMiddleware.js:6:22 at async /var/task/index.js:78:26 at async /var/task/index.js:66:9 at async Runtime.lambdaHandler [as handler] (/var/task/index.js:57:5)