diff --git a/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetCondition.java b/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetCondition.java
index e50566b70..caa631b28 100644
--- a/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetCondition.java
+++ b/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetCondition.java
@@ -95,8 +95,13 @@ public void getTooltip(List<Component> curTooltip) {
     @Override
     public void addErrors(List<Component> curInfo, List<IProgWidget> widgets) {
         super.addErrors(curInfo, widgets);
+
+        IProgWidget textTrue = getConnectedParameters()[getParameters().size() - 1];
+        IProgWidget textFalse = getConnectedParameters()[getParameters().size() * 2 - 1];
         if (getMeasureVar().isEmpty() && getConnectedParameters()[getParameters().size() - 1] == null && getConnectedParameters()[getParameters().size() * 2 - 1] == null) {
             curInfo.add(xlate("pneumaticcraft.gui.progWidget.condition.error.noFlowControl"));
+        } else if (getOutputWidget() != null && textTrue != null && textFalse != null) {
+            curInfo.add(xlate("pneumaticcraft.gui.progWidget.condition.error.badFlowControl"));
         }
     }
 
diff --git a/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetConditionBase.java b/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetConditionBase.java
index f3f57cc01..b1c328eb1 100644
--- a/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetConditionBase.java
+++ b/src/main/java/me/desht/pneumaticcraft/common/drone/progwidgets/ProgWidgetConditionBase.java
@@ -55,13 +55,15 @@ public WidgetDifficulty getDifficulty() {
     @Override
     public void addErrors(List<Component> curInfo, List<IProgWidget> widgets) {
         super.addErrors(curInfo, widgets);
-        IProgWidget widget = getConnectedParameters()[getParameters().size() - 1];
-        IProgWidget widget2 = getConnectedParameters()[getParameters().size() * 2 - 1];
+        IProgWidget textTrue = getConnectedParameters()[getParameters().size() - 1];
+        IProgWidget textFalse = getConnectedParameters()[getParameters().size() * 2 - 1];
         boolean hasMeasureVar = this instanceof ICondition cond && !cond.getMeasureVar().isEmpty();
-        if (widget == null && widget2 == null && !hasMeasureVar) {
+        if (textTrue == null && textFalse == null && !hasMeasureVar) {
             curInfo.add(xlate("pneumaticcraft.gui.progWidget.condition.error.noFlowControl"));
-        } else if (widget != null && !(widget instanceof ProgWidgetText) || widget2 != null && !(widget2 instanceof ProgWidgetText)) {
+        } else if (textTrue != null && !(textTrue instanceof ProgWidgetText) || textFalse != null && !(textFalse instanceof ProgWidgetText)) {
             curInfo.add(xlate("pneumaticcraft.gui.progWidget.condition.error.shouldConnectTextPieces"));
+        } else if (getOutputWidget() != null && textTrue != null && textFalse != null) {
+            curInfo.add(xlate("pneumaticcraft.gui.progWidget.condition.error.badFlowControl"));
         }
     }
 
diff --git a/src/main/resources/assets/pneumaticcraft/lang/en_us.json b/src/main/resources/assets/pneumaticcraft/lang/en_us.json
index 4e38e3c14..3a73a255f 100644
--- a/src/main/resources/assets/pneumaticcraft/lang/en_us.json
+++ b/src/main/resources/assets/pneumaticcraft/lang/en_us.json
@@ -1303,6 +1303,7 @@
    "pneumaticcraft.gui.progWidget.conditionBlock.checkForLiquids" : "Check for Liquids",
    "pneumaticcraft.gui.progWidget.conditionBlock.checkForLiquids.tooltip" : "Special condition. When checked, a block passes the filter when it's a liquid.",
    "pneumaticcraft.gui.progWidget.conditionCoordinate.error.noAxisSelected" : "No checking axis selected. You need to check at least one condition for its value for the condition to work.",
+   "pneumaticcraft.gui.progWidget.condition.error.badFlowControl" : "With branch labels on both right (true) and left (false), the widget below is never used!",
    "pneumaticcraft.gui.progWidget.condition.error.noFlowControl" : "No output label selected. The flow will continue downwards, regardless of the outcome of the condition.",
    "pneumaticcraft.gui.progWidget.condition.error.shouldConnectTextPieces" : "You should only connect Text puzzle pieces that reference a Label puzzle piece with a text piece.",
    "pneumaticcraft.gui.progWidget.condition.anyBlock" : "Any Block",