diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/IDEKotlinBinaryClassCache.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/IDEKotlinBinaryClassCache.kt
index 8dd1edfdd54..b7a7f92291a 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/IDEKotlinBinaryClassCache.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/IDEKotlinBinaryClassCache.kt
@@ -20,6 +20,7 @@ import com.intellij.ide.highlighter.JavaClassFileType
 import com.intellij.openapi.components.ServiceManager
 import com.intellij.openapi.util.Key
 import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.openapi.vfs.VirtualFileWithId
 import org.jetbrains.kotlin.load.kotlin.KotlinBinaryClassCache
 import org.jetbrains.kotlin.load.kotlin.KotlinJvmBinaryClass
 import org.jetbrains.kotlin.load.kotlin.header.KotlinClassHeader
@@ -53,7 +54,9 @@ object IDEKotlinBinaryClassCache {
         val kotlinBinaryClass = KotlinBinaryClassCache.getKotlinBinaryClass(file, fileContent)
 
         val isKotlinBinaryClass = kotlinBinaryClass != null
-        attributeService.writeBooleanAttribute(KOTLIN_IS_COMPILED_FILE_ATTRIBUTE, file, isKotlinBinaryClass)
+        if (file is VirtualFileWithId) {
+            attributeService.writeBooleanAttribute(KOTLIN_IS_COMPILED_FILE_ATTRIBUTE, file, isKotlinBinaryClass)
+        }
 
         if (isKotlinBinaryClass) {
             val headerInfo = createHeaderInfo(kotlinBinaryClass)
@@ -99,7 +102,10 @@ object IDEKotlinBinaryClassCache {
             return userData
         }
 
-        val isKotlinBinaryAttribute = attributeService.readBooleanAttribute(KOTLIN_IS_COMPILED_FILE_ATTRIBUTE, file)
+        val isKotlinBinaryAttribute = if (file is VirtualFileWithId)
+            attributeService.readBooleanAttribute(KOTLIN_IS_COMPILED_FILE_ATTRIBUTE, file)
+        else
+            null
 
         if (isKotlinBinaryAttribute != null) {
             val isKotlinBinary = isKotlinBinaryAttribute.value