diff --git a/AlgebraicDataflowArchitectureModel/src/application/editor/Editor.java b/AlgebraicDataflowArchitectureModel/src/application/editor/Editor.java
index b0db12f..ed5bfa9 100644
--- a/AlgebraicDataflowArchitectureModel/src/application/editor/Editor.java
+++ b/AlgebraicDataflowArchitectureModel/src/application/editor/Editor.java
@@ -367,7 +367,7 @@
     public void addResourcePath(ResourcePath parentPath, String resName) {
         // Force to change to data-flow modeling stage
         boolean stageChanged = changeStage(STAGE_DATA_FLOW_MODELING);
-        if (stageChanged) {
+        if (!stageChanged) {
             return;
         }
         ((DataFlowModelingStage) curStage).addResourcePath(parentPath, resName);
@@ -377,7 +377,7 @@
     public void addChannel(DataTransferChannel channelGen) {
         // Force to change to data-flow modeling stage
         boolean stageChanged = changeStage(STAGE_DATA_FLOW_MODELING);
-        if (stageChanged) {
+        if (!stageChanged) {
             return;
         }
         ((DataFlowModelingStage) curStage).addChannel(channelGen);
@@ -387,7 +387,7 @@
     public void addIOChannel(DataTransferChannel ioChannelGen) {
         // Force to change to data-flow modeling stage
         boolean stageChanged = changeStage(STAGE_DATA_FLOW_MODELING);
-        if (stageChanged) {
+        if (!stageChanged) {
             return;
         }
         ((DataFlowModelingStage) curStage).addIOChannel(ioChannelGen);
@@ -397,7 +397,7 @@
     public void addFormulaChannel(FormulaChannel formulaChannelGen) {
         // Force to change to data-flow modeling stage
         boolean stageChanged = changeStage(STAGE_DATA_FLOW_MODELING);
-        if (stageChanged) {
+        if (!stageChanged) {
             return;
         }
         ((DataFlowModelingStage) curStage).addFormulaChannel(formulaChannelGen);