fix(config): prevent panic by checking reflect.Value.IsValid() (#334)

pkg/config/config.go

@@ -239,10 +239,15 @@ func (config *Config) ParseUserFile(conf map[string]any) {
 				}
 			} else {
 				fv := prop.assign(k, v)
+				if fv.IsValid() {
 					prop.File = fv.Interface()
 					if prop.Env == nil {
 						prop.Ptr.Set(fv)
 					}
+				} else {
+					// continue invalid field
+					slog.Error("Attempted to access invalid field during config parsing: %s", v)
+				}
 			}
 		}
 	}