diff --git a/lib/mergeset/table.go b/lib/mergeset/table.go
index 73e95870e..a10ce4a58 100644
--- a/lib/mergeset/table.go
+++ b/lib/mergeset/table.go
@@ -1477,17 +1477,17 @@ func mustWritePartNames(pws []*partWrapper, dstDir string) {
 
 func mustReadPartNames(srcDir string) []string {
 	partNamesPath := filepath.Join(srcDir, partsFilename)
-	data, err := os.ReadFile(partNamesPath)
-	if err == nil {
+	if fs.IsPathExist(partNamesPath) {
+		data, err := os.ReadFile(partNamesPath)
+		if err != nil {
+			logger.Panicf("FATAL: cannot read %s file: %s", partsFilename, err)
+		}
 		var partNames []string
 		if err := json.Unmarshal(data, &partNames); err != nil {
 			logger.Panicf("FATAL: cannot parse %s: %s", partNamesPath, err)
 		}
 		return partNames
 	}
-	if !os.IsNotExist(err) {
-		logger.Panicf("FATAL: cannot read %s file: %s", partsFilename, err)
-	}
 	// The partsFilename is missing. This is the upgrade from versions previous to v1.90.0.
 	// Read part names from directories under srcDir
 	des := fs.MustReadDir(srcDir)
diff --git a/lib/storage/partition.go b/lib/storage/partition.go
index 8b344453f..85e4611df 100644
--- a/lib/storage/partition.go
+++ b/lib/storage/partition.go
@@ -1903,17 +1903,17 @@ func getPartNames(pws []*partWrapper) []string {
 
 func mustReadPartNames(smallPartsPath, bigPartsPath string) ([]string, []string) {
 	partNamesPath := filepath.Join(smallPartsPath, partsFilename)
-	data, err := os.ReadFile(partNamesPath)
-	if err == nil {
+	if fs.IsPathExist(partNamesPath) {
+		data, err := os.ReadFile(partNamesPath)
+		if err != nil {
+			logger.Panicf("FATAL: cannot read %s file: %s", partsFilename, err)
+		}
 		var partNames partNamesJSON
 		if err := json.Unmarshal(data, &partNames); err != nil {
 			logger.Panicf("FATAL: cannot parse %s: %s", partNamesPath, err)
 		}
 		return partNames.Small, partNames.Big
 	}
-	if !os.IsNotExist(err) {
-		logger.Panicf("FATAL: cannot read %s file: %s", partsFilename, err)
-	}
 	// The partsFilename is missing. This is the upgrade from versions previous to v1.90.0.
 	// Read part names from smallPartsPath and bigPartsPath directories
 	partNamesSmall := mustReadPartNamesFromDir(smallPartsPath)