diff --git a/language/duchain/ducontext.cpp b/language/duchain/ducontext.cpp
index 33f9a91..8dbb3d4 100644
--- a/language/duchain/ducontext.cpp
+++ b/language/duchain/ducontext.cpp
@@ -456,6 +456,16 @@ bool DUContextDynamicData::removeChildContext( DUContext* context ) {
 void DUContextDynamicData::addImportedChildContext( DUContext * context )
 {
 //   ENSURE_CAN_WRITE
+  if(arrayContains(m_context->d_func_dynamic()->m_importersList(), IndexedDUContext(context)))
+  {
+    int type = context->type();
+    kDebug() << "already contained (type " << type << ")";
+    kDebug() << "in chain " << context->inDUChain();
+    kDebug() << "url:" << context->url().str();
+    SimpleRange r = context->range();
+    kDebug() << "range" << r.start.column << " " <<  r.start.line << " " << r.end.column << " " <<  r.end.line;
+    kDebug() << "context " << (void*) context;
+  }
   Q_ASSERT(!arrayContains(m_context->d_func_dynamic()->m_importersList(), IndexedDUContext(context)));
 
   m_context->d_func_dynamic()->m_importersList().append(context);