diff --git a/bundle/config/mutator/translate_notebook_paths.go b/bundle/config/mutator/translate_notebook_paths.go
index 0e629d3d..b5702024 100644
--- a/bundle/config/mutator/translate_notebook_paths.go
+++ b/bundle/config/mutator/translate_notebook_paths.go
@@ -3,7 +3,6 @@ package mutator
 import (
 	"context"
 	"fmt"
-	"os"
 	"path"
 	"path/filepath"
 	"strings"
@@ -35,10 +34,6 @@ func (m *translateNotebookPaths) rewritePath(b *bundle.Bundle, p *string) error
 	absPath := filepath.Join(b.Config.Path, relPath)
 	nb, _, err := notebook.Detect(absPath)
 	if err != nil {
-		// Ignore if this file doesn't exist. Maybe it's an absolute workspace path?
-		if os.IsNotExist(err) {
-			return nil
-		}
 		return fmt.Errorf("unable to determine if %s is a notebook: %w", relPath, err)
 	}
 
diff --git a/libs/notebook/detect.go b/libs/notebook/detect.go
index ad751fa0..38b9ec18 100644
--- a/libs/notebook/detect.go
+++ b/libs/notebook/detect.go
@@ -3,6 +3,8 @@ package notebook
 import (
 	"bufio"
 	"bytes"
+	"errors"
+	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -39,6 +41,10 @@ func readHeader(path string) ([]byte, error) {
 func Detect(path string) (notebook bool, language workspace.Language, err error) {
 	header := ""
 
+	if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
+		return false, "", fmt.Errorf("file %s does not exist", path)
+	}
+
 	// Determine which header to expect based on filename extension.
 	ext := strings.ToLower(filepath.Ext(path))
 	switch ext {