diff --git a/idea/src/org/jetbrains/kotlin/idea/debugger/JetPositionManager.kt b/idea/src/org/jetbrains/kotlin/idea/debugger/JetPositionManager.kt
index df41d245c63..c0ca4bb4af8 100644
--- a/idea/src/org/jetbrains/kotlin/idea/debugger/JetPositionManager.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/debugger/JetPositionManager.kt
@@ -175,8 +175,6 @@ public class JetPositionManager(private val myDebugProcess: DebugProcess) : Mult
 
         val project = myDebugProcess.getProject()
 
-        if (DumbService.getInstance(project).isDumb()) return null
-
         return DebuggerUtils.findSourceFileForClass(project, GlobalSearchScope.allScope(project), className, sourceName, location.lineNumber() - 1)
     }
 
diff --git a/idea/src/org/jetbrains/kotlin/idea/util/DebuggerUtils.java b/idea/src/org/jetbrains/kotlin/idea/util/DebuggerUtils.java
index fa18bcc9f1a..2cc5abd6510 100644
--- a/idea/src/org/jetbrains/kotlin/idea/util/DebuggerUtils.java
+++ b/idea/src/org/jetbrains/kotlin/idea/util/DebuggerUtils.java
@@ -20,6 +20,7 @@ import com.google.common.base.Predicate;
 import com.google.common.collect.Collections2;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Sets;
+import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.roots.libraries.LibraryUtil;
 import com.intellij.openapi.util.io.FileUtilRt;
@@ -71,6 +72,7 @@ public class DebuggerUtils {
     ) {
         String extension = FileUtilRt.getExtension(fileName);
         if (!KOTLIN_EXTENSIONS.contains(extension)) return null;
+        if (DumbService.getInstance(project).isDumb()) return null;
 
         Collection<JetFile> filesInPackage = findFilesWithExactPackage(className.getPackageFqName(), searchScope, project);
         Collection<JetFile> filesWithExactName = Collections2.filter(filesInPackage, new Predicate<JetFile>() {