TEX provides the feature of error-stop (terminates compilation with an error) and non-stop (continues processing if the error can be ignored) modes while processing a document for output generation.
By default, Neptune stops with an error. In case the user wants non-stop processing
option, it can be invoked by switching on the small white button for Ignore
Compilation Errors in the TEX Log window.
Here is TEX Log window menu bar area zoomed in: