diff --git a/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationManager.java b/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationManager.java
index c432dba85381..01b3aec82d20 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationManager.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationManager.java
@@ -904,7 +904,9 @@ public class DocumentationManager {
   }
 
   public Project getProject(@Nullable final PsiElement element) {
-    assert element == null || !element.isValid() || myProject == element.getProject();
+    if (element != null && element.isValid()) {
+      assert myProject == element.getProject() : myProject + "!=" + element.getProject();
+    }
     return myProject;
   }