diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/moduleInfosFromIdeaModel.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/moduleInfosFromIdeaModel.kt
index bdf27d81031..0ad4e9edfd9 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/moduleInfosFromIdeaModel.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/moduleInfosFromIdeaModel.kt
@@ -14,6 +14,7 @@ import com.intellij.openapi.roots.JdkOrderEntry
 import com.intellij.openapi.roots.LibraryOrderEntry
 import com.intellij.openapi.roots.ModuleRootManager
 import org.jetbrains.kotlin.caches.project.cacheInvalidatingOnRootModifications
+import org.jetbrains.kotlin.idea.util.application.runReadAction
 import org.jetbrains.kotlin.platform.TargetPlatform
 import org.jetbrains.kotlin.platform.isCommon
 import org.jetbrains.kotlin.types.typeUtil.closure
@@ -92,6 +93,6 @@ private fun mergePlatformModules(
     return rest + platformModules
 }
 
-internal fun getAllProjectSdks(): Collection<Sdk> {
-    return ProjectJdkTable.getInstance().allJdks.toList()
-}
\ No newline at end of file
+internal fun getAllProjectSdks(): Array<Sdk> = runReadAction {
+    ProjectJdkTable.getInstance().allJdks
+}