filter error

[uglyliu]

my config，vector vecsion is 0.29.1

[transforms.filter_no_httplog]
type = "filter"
inputs = ["info_logs"]
condition = '!contains(string!(.message), "httpLog") && contains(string!(.app), "gateway")'

And I run the vector，the error logs is as follows:

2024-07-09T06:09:36.900302Z ERROR transform{component_kind="transform" component_id=filter_no_httplog component_type=filter component_name=filter_no_httplog}: vector::internal_events::conditions: VRL condition execution failed. error=function call error for "contains" at (43:77): function call error for "string" at (52:65): expected string, got null error_type="script_failed" stage="processing" internal_log_rate_limit=true
2024-07-09T06:09:36.900969Z ERROR transform{component_kind="transform" component_id=filter_no_httplog component_type=filter component_name=filter_no_httplog}: vector::internal_events::conditions: Internal log [VRL condition execution failed.] is being rate limited.

Please，anyone help me,thank u very much

[jszwedko]

That indicates that .message or .app is null. What would you like to happen in that case? For it to match the filter? Or not?