diff --git a/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DataFlowModelingStage.java b/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DataFlowModelingStage.java
index 363796a..74e43fa 100644
--- a/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DataFlowModelingStage.java
+++ b/AlgebraicDataflowArchitectureModel/src/application/editor/stages/DataFlowModelingStage.java
@@ -359,7 +359,10 @@
 	public boolean connectEdge(mxCell edge, mxCell src, mxCell dst) {
 		if (bReflectingArchitectureModel) return false;
 		DataTransferModel model = getModel();
-		Channel srcCh = model.getChannel((String) src.getValue());
+
+		if (!(src.getValue() instanceof String)) return false;
+
+		Channel srcCh = model.getChannel((String) src.getValue());		
 		if (srcCh == null) {
 			srcCh = model.getIOChannel((String) src.getValue());
 			if (srcCh == null) {