diff --git a/src/main/kotlin/org/domaframework/doma/intellij/common/FileTypeCheck.kt b/src/main/kotlin/org/domaframework/doma/intellij/common/FileTypeCheck.kt
index 17d3f2f8..a5831611 100644
--- a/src/main/kotlin/org/domaframework/doma/intellij/common/FileTypeCheck.kt
+++ b/src/main/kotlin/org/domaframework/doma/intellij/common/FileTypeCheck.kt
@@ -37,6 +37,7 @@ fun getExtension(type: String): String =
  * Does it match the Dao file type condition?
  */
 fun isJavaOrKotlinFileType(daoFile: PsiFile): Boolean {
+    if (daoFile.virtualFile == null) return false
     val fileType = FileTypeManager.getInstance().getFileTypeByFile(daoFile.virtualFile)
     return when (fileType.name) {
         "JAVA", "Kotlin" -> true
@@ -57,7 +58,7 @@ fun isSupportFileType(file: PsiFile): Boolean {
 
 fun isInjectionSqlFile(file: PsiFile): Boolean {
     val extension = file.fileType.defaultExtension
-    val filePath = file.virtualFile.path
+    val filePath = file.virtualFile?.path ?: return false
     return when (extension) {
         "sql" -> true
         else -> false
diff --git a/src/main/kotlin/org/domaframework/doma/intellij/common/dao/DaoMethodUtil.kt b/src/main/kotlin/org/domaframework/doma/intellij/common/dao/DaoMethodUtil.kt
index 93ba8224..fe968d5b 100644
--- a/src/main/kotlin/org/domaframework/doma/intellij/common/dao/DaoMethodUtil.kt
+++ b/src/main/kotlin/org/domaframework/doma/intellij/common/dao/DaoMethodUtil.kt
@@ -39,7 +39,8 @@ import org.domaframework.doma.intellij.extension.getModule
  */
 fun findDaoMethod(originalFile: PsiFile): PsiMethod? {
     val project = originalFile.project
-    val module = project.getModule(originalFile.virtualFile) ?: return null
+    val virtualFile = originalFile.virtualFile ?: return null
+    val module = project.getModule(virtualFile) ?: return null
 
     if (isInjectionSqlFile(originalFile)) {
         originalFile.let {
@@ -52,7 +53,7 @@ fun findDaoMethod(originalFile: PsiFile): PsiMethod? {
         val relativePath =
             formatDaoPathFromSqlFilePath(
                 originalFile,
-                project.getContentRoot(originalFile.virtualFile)?.path ?: "",
+                project.getContentRoot(virtualFile)?.path ?: "",
                 fileTypeName,
             )
         val daoClassName: String =
@@ -110,7 +111,7 @@ fun formatDaoPathFromSqlFilePath(
     if (isInjectionSqlFile(relativeBaseSqlFile)) {
         return ""
     }
-    val sqlPath = relativeBaseSqlFile.virtualFile.path
+    val sqlPath = relativeBaseSqlFile.virtualFile?.path ?: return ""
     var relativeFilePath = sqlPath.substring(projectRootPath.length)
     if (!relativeFilePath.startsWith("/")) {
         relativeFilePath = "/$relativeFilePath"
diff --git a/src/main/kotlin/org/domaframework/doma/intellij/common/psi/PsiDaoMethod.kt b/src/main/kotlin/org/domaframework/doma/intellij/common/psi/PsiDaoMethod.kt
index a5cf0fd1..603420fd 100644
--- a/src/main/kotlin/org/domaframework/doma/intellij/common/psi/PsiDaoMethod.kt
+++ b/src/main/kotlin/org/domaframework/doma/intellij/common/psi/PsiDaoMethod.kt
@@ -166,7 +166,7 @@ class PsiDaoMethod(
                     PsiManager
                         .getInstance(psiProject)
                         .findDirectory(virtualFile) ?: return@runWriteCommandAction
-                val sqlVirtualFile = sqlOutputDirPath.createFile(sqlFileName).virtualFile
+                val sqlVirtualFile = sqlOutputDirPath.createFile(sqlFileName).virtualFile ?: return@runWriteCommandAction
                 FileEditorManager
                     .getInstance(psiProject)
                     .openFile(sqlVirtualFile, true)
diff --git a/src/main/kotlin/org/domaframework/doma/intellij/refactoring/dao/DaoRenameProcessor.kt b/src/main/kotlin/org/domaframework/doma/intellij/refactoring/dao/DaoRenameProcessor.kt
index 2b9e5a2d..02374024 100644
--- a/src/main/kotlin/org/domaframework/doma/intellij/refactoring/dao/DaoRenameProcessor.kt
+++ b/src/main/kotlin/org/domaframework/doma/intellij/refactoring/dao/DaoRenameProcessor.kt
@@ -42,7 +42,7 @@ class DaoRenameProcessor : RenameJavaClassProcessor() {
         val daoClass = getDaoClass(element.containingFile) ?: return
 
         val project = element.project
-        val virtualFile = element.containingFile.virtualFile
+        val virtualFile = element.containingFile.virtualFile ?: return
         project.getContentRoot(virtualFile)?.let {
             element.module?.getPackagePathFromDaoPath(virtualFile)?.let {
                 if (it.name == daoClass.name) {