diff -r 43db1100ebd2 -r a537bef47d07 src/pEpEngine.c
--- a/src/pEpEngine.c	Thu May 11 17:39:31 2017 +0200
+++ b/src/pEpEngine.c	Fri May 12 10:39:17 2017 +0200
@@ -2334,19 +2334,30 @@
     return session->errorstack;
 }
 
+DYNAMIC_API void clear_errorstack(PEP_SESSION session)
+{
+    free_stringlist(session->errorstack);
+    session->errorstack = new_stringlist(NULL);
+}
+
 #else
 
 static stringlist_t* dummy_errorstack = NULL;
 
 DYNAMIC_API const stringlist_t* get_errorstack(PEP_SESSION session)
 {
-	if(dummy_errorstack == NULL)
-	{
-		dummy_errorstack = new_stringlist("( Please recompile pEpEngine with -DDEBUG_ERRORSTACK )");
-	}
-	
+    if(dummy_errorstack == NULL)
+    {
+        dummy_errorstack = new_stringlist("( Please recompile pEpEngine with -DDEBUG_ERRORSTACK )");
+    }
+
     return dummy_errorstack;
 }
 
+DYNAMIC_API void clear_errorstack(PEP_SESSION session)
+{
+    // nothing to do here
+}
+
 #endif