diff --git a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/file/builder/LLFirFileBuilder.kt b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/file/builder/LLFirFileBuilder.kt
index 9093a55c519..2cc81888a92 100644
--- a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/file/builder/LLFirFileBuilder.kt
+++ b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/file/builder/LLFirFileBuilder.kt
@@ -7,8 +7,10 @@ package org.jetbrains.kotlin.analysis.low.level.api.fir.file.builder
 
 import org.jetbrains.kotlin.analysis.api.impl.barebone.annotations.ThreadSafe
 import org.jetbrains.kotlin.analysis.low.level.api.fir.LLFirModuleResolveComponents
-import org.jetbrains.kotlin.fir.builder.RawFirBuilder
+import org.jetbrains.kotlin.analysis.project.structure.getKtModule
+import org.jetbrains.kotlin.analysis.utils.errors.checkWithAttachmentBuilder
 import org.jetbrains.kotlin.fir.builder.BodyBuildingMode
+import org.jetbrains.kotlin.fir.builder.RawFirBuilder
 import org.jetbrains.kotlin.fir.declarations.FirFile
 import org.jetbrains.kotlin.psi.KtFile
 
@@ -20,6 +22,15 @@ internal class LLFirFileBuilder(
     val moduleComponents: LLFirModuleResolveComponents,
 ) {
     fun buildRawFirFileWithCaching(ktFile: KtFile): FirFile = moduleComponents.cache.fileCached(ktFile) {
+        checkWithAttachmentBuilder(ktFile.getKtModule() == moduleComponents.module, { "Modules are inconsistent" }) {
+            withEntry("file", ktFile.name)
+            withEntry("file module", ktFile.getKtModule()) {
+                it.toString()
+            }
+            withEntry("components module", moduleComponents.module) {
+                it.toString()
+            }
+        }
         val bodyBuildingMode = when {
             ktFile.isScript() -> {
                 // As 'FirScript' content is never transformed, lazy bodies are not replaced with calculated ones even on BODY_RESOLVE.