diff --git a/dive/filetree/comparer.go b/dive/filetree/comparer.go
index 8780da3..1df52a7 100644
--- a/dive/filetree/comparer.go
+++ b/dive/filetree/comparer.go
@@ -152,7 +152,7 @@ func (cmp *Comparer) AggregatedIndexes() <-chan TreeIndexKey {
 func (cmp *Comparer) BuildCache() (errors []error) {
 	for index := range cmp.NaturalIndexes() {
 		pathError, _ := cmp.GetPathErrors(index)
-		if pathError != nil {
+		if len(pathError) > 0 {
 			for _, path := range pathError {
 				errors = append(errors, fmt.Errorf("path error at layer index %s: %s", index, path))
 			}
diff --git a/dive/filetree/efficiency.go b/dive/filetree/efficiency.go
index cde56cb..cdb6b4f 100644
--- a/dive/filetree/efficiency.go
+++ b/dive/filetree/efficiency.go
@@ -63,7 +63,7 @@ func Efficiency(trees []*FileTree) (float64, EfficiencySlice) {
 				return nil
 			}
 			stackedTree, failedPaths, err := StackTreeRange(trees, 0, currentTree-1)
-			if failedPaths != nil {
+			if len(failedPaths) > 0 {
 				for _, path := range failedPaths {
 					logrus.Errorf(path.String())
 				}