diff --git a/platform/lang-impl/src/com/intellij/refactoring/introduce/inplace/AbstractInplaceIntroducer.java b/platform/lang-impl/src/com/intellij/refactoring/introduce/inplace/AbstractInplaceIntroducer.java
index e33cae73d485..d86db67e3db1 100644
--- a/platform/lang-impl/src/com/intellij/refactoring/introduce/inplace/AbstractInplaceIntroducer.java
+++ b/platform/lang-impl/src/com/intellij/refactoring/introduce/inplace/AbstractInplaceIntroducer.java
@@ -512,6 +512,7 @@ public abstract class AbstractInplaceIntroducer<V extends PsiNameIdentifierOwner
       }.execute();
     }
 
+    if (!isIdentifier(getInputName(), myExpr != null ? myExpr.getLanguage() : getLocalVariable().getLanguage())) return false;
     CommandProcessor.getInstance().executeCommand(myProject, new Runnable() {
       @Override
       public void run() {