diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/lightClasses/IdeLightClassInheritanceHelper.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/lightClasses/IdeLightClassInheritanceHelper.kt
index b2d5014cc65..3714177d6f0 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/lightClasses/IdeLightClassInheritanceHelper.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/lightClasses/IdeLightClassInheritanceHelper.kt
@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.asJava.ImpreciseResolveResult.*
 import org.jetbrains.kotlin.asJava.classes.KtLightClass
 import org.jetbrains.kotlin.asJava.classes.LightClassInheritanceHelper
 import org.jetbrains.kotlin.asJava.classes.defaultJavaAncestorQualifiedName
+import org.jetbrains.kotlin.idea.caches.resolve.util.isInDumbMode
 import org.jetbrains.kotlin.idea.search.PsiBasedClassResolver
 import org.jetbrains.kotlin.psi.KtSimpleNameExpression
 import org.jetbrains.kotlin.psi.KtSuperTypeCallEntry
@@ -34,6 +35,8 @@ class IdeLightClassInheritanceHelper : LightClassInheritanceHelper {
         baseClass: PsiClass,
         checkDeep: Boolean
     ): ImpreciseResolveResult {
+        if (baseClass.project.isInDumbMode()) return NO_MATCH
+
         val classOrObject = lightClass.kotlinOrigin ?: return UNSURE
         val entries = classOrObject.superTypeListEntries
         val hasSuperClass = entries.any { it is KtSuperTypeCallEntry }
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KtFileClassProviderImpl.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KtFileClassProviderImpl.kt
index bc76e3a0926..e2b31af3501 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KtFileClassProviderImpl.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KtFileClassProviderImpl.kt
@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.asJava.classes.KtLightClassForFacade
 import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.fileClasses.JvmFileClassUtil
 import org.jetbrains.kotlin.fileClasses.javaFileFacadeFqName
-import org.jetbrains.kotlin.idea.caches.project.getModuleInfo
+import org.jetbrains.kotlin.idea.caches.resolve.util.isInDumbMode
 import org.jetbrains.kotlin.psi.KtClassOrObject
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.KtFileClassProvider
@@ -21,6 +21,10 @@ import org.jetbrains.kotlin.psi.analysisContext
 class KtFileClassProviderImpl(val kotlinAsJavaSupport: KotlinAsJavaSupport) :
     KtFileClassProvider {
     override fun getFileClasses(file: KtFile): Array<PsiClass> {
+        if (file.project.isInDumbMode()) {
+            return PsiClass.EMPTY_ARRAY
+        }
+
         // TODO We don't currently support finding light classes for scripts
         if (file.isCompiled || file.isScript()) {
             return PsiClass.EMPTY_ARRAY
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/util/dumbUtils.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/util/dumbUtils.kt
new file mode 100644
index 00000000000..80089c79f61
--- /dev/null
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/util/dumbUtils.kt
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.caches.resolve.util
+
+import com.intellij.openapi.diagnostic.Logger
+import com.intellij.openapi.project.DumbService
+import com.intellij.openapi.project.Project
+
+
+private val LOG = Logger.getInstance("kotlin.resolve.dumb.mode")
+
+fun Project.isInDumbMode(): Boolean {
+    val dumbService = DumbService.getInstance(this)
+    val dumb = dumbService.isDumb
+    if (dumb && dumbService.isAlternativeResolveEnabled) {
+        LOG.warn("Kotlin does not support alternative resolve", Throwable("<stacktrace>"))
+    }
+    return dumb
+}
+