fix pathfinder panic

pathfind.go

@@ -72,6 +72,10 @@ func setValueUsingPath[D any](obj D, keyWithDots string, newValue string) error
 
 	}
 
+	if v.Kind() == reflect.Invalid {
+		return newInvalidPathError(keyWithDots)
+	}
+
 	for v.Kind() == reflect.Ptr {
 		v = v.Elem()
 	}