diff --git a/src/EvolutionSyncClient.cpp b/src/EvolutionSyncClient.cpp
index 62ba4799..0efdbbc4 100644
--- a/src/EvolutionSyncClient.cpp
+++ b/src/EvolutionSyncClient.cpp
@@ -727,6 +727,11 @@ void EvolutionSyncClient::initSources(SourceList &sourceList, EvolutionClientCon
             
             // also open it; failing now is still safe
             syncSource->open();    
+        } else {
+            // set empty type to prevent inclusion in DevInfo with invalid infos
+            sc.setType("");
+            sc.setVersion("");
+            sc.setSupportedTypes("");
         }
     }