diff --git a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt
index ab0291912a5..7d498715225 100644
--- a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt
+++ b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt
@@ -68,7 +68,7 @@ class FirJavaElementFinder(
             firProvider.getFirClassifierByFqName(classId) as? FirRegularClass
                 ?: return null
 
-        val ktFile = firClass.psi?.containingFile as KtFile
+        val ktFile = firClass.psi?.containingFile as? KtFile ?: return null
         val fileStub = createJavaFileStub(classId.packageFqName, listOf(ktFile))
 
         return buildStub(firClass, fileStub).psi
diff --git a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt.183 b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt.183
index df7a3aa9283..15723a66689 100644
--- a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt.183
+++ b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaElementFinder.kt.183
@@ -68,7 +68,7 @@ class FirJavaElementFinder(
             firProvider.getFirClassifierByFqName(classId) as? FirRegularClass
                 ?: return null
 
-        val ktFile = firClass.psi?.containingFile as KtFile
+        val ktFile = firClass.psi?.containingFile as? KtFile ?: return null
         val fileStub = createJavaFileStub(classId.packageFqName, listOf(ktFile))
 
         return buildStub(firClass, fileStub).psi