diff --git a/idea/jvm-debugger/jvm-debugger-evaluation/src/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluatorBuilder.kt b/idea/jvm-debugger/jvm-debugger-evaluation/src/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluatorBuilder.kt
index e501109b27b..6685dbec46d 100644
--- a/idea/jvm-debugger/jvm-debugger-evaluation/src/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluatorBuilder.kt
+++ b/idea/jvm-debugger/jvm-debugger-evaluation/src/org/jetbrains/kotlin/idea/debugger/evaluate/KotlinEvaluatorBuilder.kt
@@ -120,8 +120,10 @@ class KotlinEvaluator(val codeFragment: KtCodeFragment, val sourcePosition: Sour
     }
 
     private fun evaluateWithStatus(context: EvaluationContextImpl, status: EvaluationStatus): Any? {
-        if (DumbService.getInstance(codeFragment.project).isDumb) {
-            evaluationException("Code fragment evaluation is not available in the dumb mode")
+        runReadAction {
+            if (DumbService.getInstance(codeFragment.project).isDumb) {
+                evaluationException("Code fragment evaluation is not available in the dumb mode")
+            }
         }
 
         val frameProxy = context.frameProxy ?: run {