diff --git a/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/sessions/FirIdeSessionProviderStorage.kt b/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/sessions/FirIdeSessionProviderStorage.kt
index a358f13412f..433ff9b8f89 100644
--- a/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/sessions/FirIdeSessionProviderStorage.kt
+++ b/idea/idea-frontend-fir/idea-fir-low-level-api/src/org/jetbrains/kotlin/idea/fir/low/level/api/sessions/FirIdeSessionProviderStorage.kt
@@ -132,5 +132,5 @@ private class FirSessionWithModificationTracker(
         isInvalidated = true
     }
 
-    val isValid: Boolean get() = isInvalidated || modificationTracker.modificationCount == timeStamp
+    val isValid: Boolean get() = !isInvalidated && modificationTracker.modificationCount == timeStamp
 }
\ No newline at end of file