diff --git a/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/KtSymbolIndex.kt b/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/KtSymbolIndex.kt
index 7f0c9118ca..5449efcd76 100644
--- a/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/KtSymbolIndex.kt
+++ b/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/index/KtSymbolIndex.kt
@@ -5,6 +5,7 @@ import com.itsaky.androidide.lsp.kotlin.compiler.CompilationKind
 import com.itsaky.androidide.lsp.kotlin.compiler.modules.KtModule
 import com.itsaky.androidide.lsp.kotlin.compiler.read
 import com.itsaky.androidide.lsp.kotlin.utils.toVirtualFileOrNull
+import com.itsaky.androidide.utils.DocumentUtils
 import kotlinx.coroutines.CoroutineName
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -172,8 +173,9 @@ internal class KtSymbolIndex(
 
 	fun getOpenedKtFile(path: Path) = openedFiles[path]
 
-	fun getKtFile(vf: VirtualFile): KtFile {
+	fun getKtFile(vf: VirtualFile): KtFile? {
 		val path = vf.toNioPath()
+		if (!DocumentUtils.isKotlinFile(path)) return null
 
 		openedFiles[path]?.also { return it }
 		ktFileCache.getIfPresent(path)?.also { return it }
diff --git a/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DeclarationsProvider.kt b/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DeclarationsProvider.kt
index c3973b394d..f7c0e271e6 100644
--- a/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DeclarationsProvider.kt
+++ b/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DeclarationsProvider.kt
@@ -180,6 +180,6 @@ internal class DeclarationProvider(
 		return index.filesForPackage(fqName.asString())
 			.mapNotNull { VirtualFileManager.getInstance().findFileByNioPath(Paths.get(it.filePath)) }
 			.filter { it in scope }
-			.map { index.getKtFile(it) }
+			.mapNotNull { index.getKtFile(it) }
 	}
 }
diff --git a/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DirectInheritorsProvider.kt b/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DirectInheritorsProvider.kt
index 7036744413..df24ee2918 100644
--- a/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DirectInheritorsProvider.kt
+++ b/lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/compiler/services/DirectInheritorsProvider.kt
@@ -82,7 +82,7 @@ internal class DirectInheritorsProvider: KtLspService, KotlinDirectInheritorsPro
 		modules
 			.asFlatSequence()
 			.filter { it.isSourceModule }.flatMap { it.computeFiles(extended = true) }
-			.map { index.getKtFile(it) }
+			.mapNotNull { index.getKtFile(it) }
 			.forEach { ktFile ->
 				ktFile.accept(object : KtTreeVisitorVoid() {
 					override fun visitClassOrObject(classOrObject: KtClassOrObject) {