diff --git a/platform/lang-impl/src/com/intellij/codeInsight/completion/command/CommandCompletionService.kt b/platform/lang-impl/src/com/intellij/codeInsight/completion/command/CommandCompletionService.kt
index 3c40bbf41a54..4f47310777c0 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/completion/command/CommandCompletionService.kt
+++ b/platform/lang-impl/src/com/intellij/codeInsight/completion/command/CommandCompletionService.kt
@@ -358,7 +358,8 @@ private class CommandCompletionHighlightingListener(
   }
 
   override fun dispose() {
-    clear(lookup.editor)
+    val lookupEditor = runReadAction { lookup.editor }
+    clear(lookupEditor)
   }
 }